IRONS, ROBERT HATFIELD, President, Central Iron and Steel Company, Harrisburg, Pennsylvania.

ISRAEL, JOSEPH D., District Manager, The Philadelphia Electric Company, 10th and Chestnut Streets, Philadelphia, Pennsylvania.

ITTNER, MARTIN HILL, Chief Chemist, Colgate and Company, Jersey City, New Jersey.

IVES, FRED E., Inventor, 1327 Spruce Street, Philadelphia, Pennsylvania.

IVES, Dr. HERBERT E., Physicist, in care of Western Electric Company, 463 West Street, New York City, New York.

JACKSON, A. C., Manufacturer, 4530 Tacony Street, Philadelphia, Pennsylvania. JACKSON, JOHN PRICE, Pennsylvania Commissioner of Labor and Industry, Harrisburg, Pennsylvania, and for mail, 129 Coulter Street, Ardmore, Pennsylvania. JACKSON, WILLIAM STEELL, Patent Attorney, 1001 Chestnut Street, Philadelphia, JACOBUS, D. S., Advisory Engineer, The Babcock and Wilcox Company, 85 Liberty Street, New York City, New York.

Pennsylvania.

JEANES, ISAAC W., Room 908, Lafayette Building, Philadelphia, Pennsylvania.
JEFFERSON, J. P., Manufacturer, P. O. Box 645, Santa Barbara, California.

JEFFERIES, ZAY, Metallurgical Engineer, in care of Aluminum Castings Company, 2800
Harvard Avenue, Cleveland, Ohio.

JENKINS, C. FRANCIS, Inventor, 5502 16th St., N. W., Washington, D. C.

JENKINS, THEODORE F., Attorney-at-Law, 1100 Franklin Bank Building, Philadelphia, Pennsylvania.

JENNINGS, W. N., Business Photographer, 1321 Arch Street, Philadelphia, Pennsylvania. JOB, ROBERT, Vice President, Milton Hersey Company, Limited, 84 St. Antoine Street, Montreal, Quebec, Canada.

JOHANSEN, ERNST, Chemist, New England Oil Refining Company, Fall River, Massachusetts.

JOHNSON, ERNEST EDWARD, Professor of Physics, Northeast High School, and for mail, 201 W. Ontario Street, Philadelphia, Pennsylvania.

JOHNSON, JAMES CURTIS, General Superintendent of Transportation, Pennsylvania Railroad Company, Broad Street Station, Philadelphia, Pennsylvania.

JOHNSON, WALTER H., First Vice President Philadelphia Electric Company, 1000 Chestnut Street, Philadelphia, Pennsylvania.

JONES, JONATHAN, Engineer, P. O. Box 1593, Pittsburgh. Pennsylvania.
JONES, JONATHAN R., Iron and Steel Manufacturer, 1800 Widener Bldg., Phila-
delphia, Pennsylvania.

JONES, JULIAN D., Superintendent, Telegraph and Signals. Eastern Region, Penn-
sylvania System, Room 152, Broad Street Station, Philadelphia. Pennsylvania.
JONES. W. CLYDE, Attorney-at-Law, 77 West Washington St.. Chicago, Illinois.
JUNKERSFELD, P.. Engineer and General Supervisor in Electric Supply Business, in
care of McClellen and Junkersfeld, Incorporated, 45 William Street, New York
City, New York.
JUSTI. HENRY M.. 32nd and Spring Garden Sts.. Philadelphia, Pennsylvania.
KABAKJIAN, Dr. D. H., Assistant Professor of Physics, University of Pennsylvania,
Philadelphia, Pennsylvania.

KALTENTHALER. H. J.. Manufacturer of Steam Specialties, 6457 Woodbine Ave.,
Overbrook, Philadelphia, Pennsylvania.

KARRER, ENOCH. Physicist, Nela Research Laboratory, Nela Park, Cleveland, Ohio. KAUFMAN, H. M., General Manager. Mutual Chemical Company of America, 110 William Street, New York City, New York.

KAVANAUGH. WM. H.. Professor of Experimental Engineering, Towne Scientific School, University of Pennsylvania, Philadelphia, Pennsylvania.

KEBLER. LEONARD President, Ward Leonard Electric Company, Mt. Vernon, New York and for mail. Avon Road, Bronxville, New York.

KEITH. C. P., in care of W. G. Peters, 69 Van Antwerp Road, Schenectady. New York. KELLER, F. E.. Engineer and Manufacturer, Hotel Sagamore, Rochester, New York. KELLER, HARRY F., Educator and Chemist, 103 W. Upsal Street, Germantown, Philadelphia, Pennsylvaia.

KELLEY, Dr. GEORGE L., Research Chemist, 6804 McCallum Street, Philadelphia, Pennsylvania.

KELLOGG. HOSFORD D., Manager, The H. B. Smith Company, 17th and Arch Streets, Philadelphia, Pennsylvania.

KEMMERER. M. S.. Coal Merchant, Mauch Chunk, Pennsylvania.

KENNEDY. FRANK G., JR., President. Logan Iron and Steel Company, 1218 Stephen Girard Building, and for mail, 2043 Spruce Street. Philadelphia, Pennsylvania. KENNEDY, J. J., Consulting Engineer, 52 Broadway, New York City, New York. KENNEDY, M. C.. Vice President. Pennsylvania Railroad Company, Broad Street Station, Philadelphia, Pennsylvania.

KENNELLY, Dr. A. E., Professor of Electrical Engineering, Harvard University, Cambridge, Massachusetts.

KENT, A. ATWATER, Manufacturer, Ardmore, Pennsylvania.

KENT S. LEONARD, Jr., Hydro-Electrics, Manayunk, Philadelphia, Pennsylvania. KERLIN, W. D., Secretary and Treasurer, Camden Forge Company, Camden, New Jersey.

KERR, WILLIAM M., Manufacturer, 1421 Chestnut Street, Philadelphia, Pennsylvania.

KETCHAM, O. W., Manufacturer of Architectural Terra Cotta, 24 South Seventh Street, Philadelphia, Pennsylvania.

KETTERLINUS, J. L., Lithographer, 4th and Arch Streets, Philadelphia, Pennsylvania. KILPATRICK, J. L., 181 Ridgewood Avenue, Glen Ridge, N. J.

KIMBER, WILLIAM M. C., Manufacturer of Electrical Instruments, Leeds and Northrup Company, 4901 Stenton Avenue, Germantown, Philadelphia, Pennsylvania. KINEALY, JOHN HENRY, Consulting Engineer, 503 Granite Building, St. Louis,

Missouri.

KING, CHARLES W. G., Mechanical Engineer, 125 Linden Avenue, Rutledge, Delaware County, Pennsylvania.

KING, JOSEPH B., Jr., Assistant in Research Laboratory, Electric Storage Battery Company, and for mail, 7315 Boyer Street, Mt. Airy, Philadelphia, Pennsylvania. KINGSBURY, Dr. EDWIN F., Physicist, Western Electric Company, 463 West Street, New York City, New York.

KINNARD. L. H., President, The Bell Telephone Company, 1631 Arch Street, Philadelphia, Pennsylvania.

KINNIER, GEORGE E., Civil Engineer, 94 Broad Street, Woodbury, New Jersey.
KIPPENBERG, HENRY, in care of Merck and Company, Rahway, New Jersey.
KIRK, C. J., President, United States Sherardizing Company, New Castle, Pennsylvania.
KLEMM, J. GEORGE, Jr., Heating and Ventilating Engineer, Box 284, Haverford,
Pennsylvania.

KLINE, C. MAHLON, Wholesale Druggist, 429 Arch Street, Philadelphia, Pennsylvania.
KLIPSTEIN, A., Merchant, 644-54 Greenwich Street, New York City, New York.
KLUMPP, JOHN BARTLEMAN, Inspecting Engineer, The United Gas Improvement
Company, Broad and Arch Streets, I'hiladelphia, Pennsylvania.

KNAPP, ARTHUR, Petroleum Engineer, 210 Strathmore Road, Upper Darby, Phila

delphia, Pennsylvania.

KNAPP, I. N., Engineer, 504 Aspen Street, N. W., Takoma Park, D. C.

KNEASS, STRICKLANƆ L., Mechanical Engineer, 1600 Hamilton Street, Philadelphia,

Pennsylvania.

KNOEDLER, E. L., General Superintendent, The Welsbach Company, Gloucester, New Jersey.

KNOX, HENRY HOBART, Mining Engineer, 160 Broadway, New York City, New York. KOCH, GEORGE B., General Foreman, South Altoona Foundries, Pennsylvania Railroad Company, Altoona Pennsylvania.

KOCH, JULIUS A., Professor of Chemistry and Dean of School of Pharmacy, University of Pittsburgh, Bluff and Pride Streets, Pittsburgh, Pennsylvania.

KOHN, JOSEPH, Secretary and Treasurer, Universal Dental Company, 2204 Natrona Street, Philadelphia, Pennsylvania.

KOTHNY, G. L., Consulting Engineer, C. H. Wheeler Manufacturing Company, and for mail, Woodland Road, Strafford, Pennsylvania.

KREBS, A. S., Mechanical Engineer, Krebs Pigment and Chemical Company, Newport, Delaware.

KREBS, H. J., President, Krebs Pigment and Chemical Company, P. O. Box 951, Wilmington, Delaware.

KRUTTSCHNITT. J., Civil Engineer, Southern Pacific Company, 165 Broadway, New York City, New York.

KUESEL, Dr. GEORGE C., Dentist, 1614 Locust Street, Philadelphia, Pennsylvania. KUHN, C. HARTMAN, 202 Liberty Building, Philadelphia, Pennsylvania.

KUTTROFF, EDWIN, President, Verona Chemical Company, North Newark, New Jersey.

LAIRD, CLINTON N., Chemist, Canton Christian College, Canton, China. LANDRETH, C. P., Manufacturer, Electrolytic Purification Company, 15th Street and Lehigh Avenue, Philadelphia, Pennsylvania.

LANE, DAVID H. (Retired), 408 Land Title Building, Philadelphia, Pennsylvania.
LANZA, GAETANO, Engineer, Special Consultant, The Baldwin Locomotive Works, and
for mail, The Montevista, 63rd and Oxford Streets, Philadelphia, Pennsylvania.
LAUER, CONRAD, Genera! Manager, Day and Zimmermann, and for mail, 233 West
Hortter Street, Germantown, Philadelphia, Pennsylvania.

LAVINO, E. J., Merchant, 471 Bullitt Building, Philadelphia, Pennsylvania.
LAWALL, CHARLES H., Analytical Chemist, 636 Franklin Square, Philadelphia, Penn-

sylvania.

LAWLER, G. S., Electrical Engineer, Associated Factory Mutual Fire Insurance Companies, Fort Hill Square, 184 High Street, Boston, Massachussets.

LAY, JOHN TRACY, Research Assistant in Physics, University of Pennsylvania, and for mail, 4015 Pine Street, Philadelphia, Pennsylvania.

LE BOUTILLIER, HENRY W., Chemist, Wayne, Pennsylvania.
LE BOUTILLIER, ROBERT, Wayne, Pennsylvania.

LEDOUX, J. W., Chief Engineer, American Pipe Manufacturing Company, 112 North
Broad Street, Philadelphia, Pennsylvania.

LEE, ELISHA, General Manager, Pennsylvania Railroad Company, Broad Street Station, Philadelphia, Pennsylvania.

LEE, JAMES D., Jr., 5929 Greene Street, Germantown, Philadelphia, Pennsylvania. LEE, WALTER T., Accountant, 308 Rex Avenue, Chestnut Hill, Philadelphia, Pennsylvania.

LEEDS, MORRIS E.. Manufacturer of Scientific Instruments, 4901 Stenton Avenue, Germantown, Philadelphia, Pennsylvania.

LEFFMANN, HENRY, Chemist, 1839 North 17th Street, Philadelphia, Pennsylvania. LEIGHNINGER, WILLIAM B., Teacher, Chemistry, Frankford High School, and for mail, 1123 Harrison Street, Frankford, Philadelphia, Pennsylvania.

LE MAISTRE, F. J., Chemical Engineer, 810 Bellevue Court Building, Philadelphia,
Pennsylvania.
LEMOINE, L. R., President, United States Cast Iron Pipe and Foundry Company,
Morris Building, Philadelphia, Pennsylvania.

LENHER, Major VICTOR, Chemist, 158 Summit Avenue, Madison, Wisconsin.
LENKER, WILL G., Civil Engineer, 405 Chestnut Street, Sunbury, Pennsylvania.
LESLEY, ROBERT W., Manufacturer, 612 Pennsylvania Building, Philadelphia, Penn-

sylvania.

LEVY, HOWARD S., 1424 North Fifteenth Street, Philadelphia, Pennsylvania.
LEVY, LIONEL FARADAY, Chemical Engineer, Manager, Repro Art Machinery Com-
pany, and for mail, 220 West Roberts Avenue. Philadelphia, Pennsylvania.
LEVY, MAX, Manufacturer and Photo-Engraver, Lenox Apartments, 13th and Spruce
Streets, Philadelphia, Pennsylvania.
LEWIS, A. NELSON, Attorney-at-Law, 1811 Walnut Street, Philadelphia, Pennsylvania.
LEWIS, DANIEL C., Agent, The Millville Manufacturing Company, Millville, New
LEWIS, GEorge w., Mechanical Engineer, National Advisory Committee for Aero-
nautics 2722 Navy Building, Washington, D. C.

Jersey.

LEWIS, HOWARD W., Banker, 1928 Spruce Street, Philadelphia, Pennsylvania. LEWIS, JOHN F., Attorney-at-Law, 208 South 4th Street, Philadelphia, Pennsylvania. LEWIS, NATHAN E., Mechanical Engineer, Babcock Wilcox Company, 85 Liberty Street, New York City, New York.

LEWIS, PAUL A., Physician. Director of Laboratory, The Henry Phipps Institute, 7th and Lombard Streets, Philadelphia, Pennsylvania.

LEWIS, ROBERT B., Mechanical Engineer, 51 East Penn Street, Germantown, Philadelphia, Pennsylvania.

LEWIS, WILFRED, Mechanical Engineer, President, The Tabor Manufacturing Company, and for mail, Rose Lane, Haverford, Pennsylvania.

LICHTENBERG, Captain CHESTER, Electrical Engineer, 136 Waverly Place, Schenectady, New York.

LIEB, J. W.. Vice President, The New York Edison Company, 15th Street and Irving Place, New York City, New York.

LIEBER, HUGO. Chemist, President, H. Lieber and Company, 19 West 44th Street, New York City, New York.

LIGHTFOOT, THOMAS M.. Retired Educator, Chesham, New Hampshire.

LIHME, I. P.. Chemical Engineer, The Grasselli Chemical Company, Cleveland, Ohio. LILLIE, LEWIS, Vice President. The United Gas Improvement Company, Broad and Arch Streets. Philadelphia, Pennsylvania.

LILLIE, S. MORRIS. President, Sugar Apparatus Refining Company, 4804 Springfield Avenue Philadelphia, Pennsylvania.

LINDENTHAL, GUSTAV, Consulting Engineer, Room 738 Pennsylvania R. R. Station, New York City, New York.

LIPPINCOTT, J. BERTRAM, Publisher, 229 South 6th Street, Philadelphia, Pennsylvania.

LIPPINCOTT. JOSEPH W.. Publisher, Bethayres, Pennsylvania.

LITTLE, ARTHUR D., President, Arthur D. Little, Incorporated, 30 Charles River Road, Cambridge, Massachusetts.

LIVERSIDGE, HORACE P.. Philadelphia Electric Company, 1000 Chestnut Street, Philadelphia, Pennsylvania.

LIVINGSTON, HERMAN, Hydro Carbon Engineer, Calco Chemical Company, Richards Park, Somerville, New Jersey.

LLEWELLYN. W. H.. Druggist. 1518 Chestnut Street, Philadelphia, Pennsylvania. LLOYD. HERBERT, President, Electric Storage Battery Company, Philadelphia, Penn

sylvania.

LLOYD, JOHN URI, Manufacturing Pharmacist and Chemist, Clifton and Lafayette Avenues, Cincinnati, Ohio.

LLOYD. MORTON G., Electrical Engineer. Bureau of Standards, Washington, D. C. LOBBEN, PEDER, Mechanical Engineer, Room No. 2, Keysers Gade 1, Kristiania,

Norway.

LODGE. ROLLA M., Engineer and Electrican, 1149 Venango Street, Philadelphia, Pennsylvania. LOEB. LEO. Mechanical Engineer, Day and Zimmermann, Incorporated, 1600 Walnut Street, Philadelphia, Pennsylvania, and for mail 333 West Seymour Street, Germantown, Philadelphia, Pennsylvania. LONERGAN. J. E.. Brass Manufacturer, 211 Race Street, Philadelphia, Pennsylvania. LONGSTRETH, CHARLES, Box 326, Coronado, California.

LONGSTRETH, EDWARD T., Manufacturer, 6805 North 11th Street, Oak Lane, Philadelphia, Pennsylvania.

LORENTZ, HENDRIK A., Physicist, Zylweg 76, Haarlem, Holland.

LOSS. HENRIK VON Z., Consulting Engineer, Atlantic City, New Jersey.

LOVEJOY, J. R., Vice President, General Electric Company, Schenectady, New York.

LOVEKIN, LUTHER D., Marine Engineer, Mill Creek Road, Ardmore, Pennsylvania. LOWE, ARTHUR W., Public School Teacher, 1224 Herbert Street, Frankford, Philadelphia, Pennsylvania.

LOWER, NATHAN M., Assistant General Manager, Locomotive Stoker Company, 292 Balph Avenue, Bellevue, Pennsylvania.

LOYD, SARAH A. C., 1206 Filbert Street, Philadelphia, Pennsylvania.

LUCKE, CHARLES EDWARD, Professor of Mechanical Engineering, Columbia Uni-
versity, New York City, New York.
LUCKIESH, Dr. M., Director of Applied Science, Nela Research Laboratories, Nela Park,
Cleveland, Ohio.

LUKENS, Dr. HIRAM S., Chemist, Harrison Laboratory, University of Pennsylvania, 34th and Spruce Streets, Philadelphia, Pennsylvania.

LUPTON, EDWARD, Manufacturer of Sheet Metal, Allegheny Avenue and Tulip Street, Philadelphia, Pennsylvania.

LYMAN, JAMES. Consulting Engineer, Member of Firm, Sargent & Lundy, 1412 Edison Building, Chicago, Illinois.

LYNCH, JOHN COOPER, General Superintendent of Traffic, The Bell Telephone Company, of Pennsylvania, 1631 Arch Street, Philadelphia, Pennsylvania.

LYON, PERCY S., Chief Engineer, H. S. B. W. Cochrane Corporation, 17th Street and Allegheny Avenue, Philadelphia, Pennsylvania.

LYSLE, FREDERIC BOWERS, Chemist-Engineer, Room 900, City Hall, Philadelphia, Pennsylvania.

MCBRIDE, THOS. C., Sales Manager, Worthington Pump and Machinery Corporation, 1516 N. American Building. Philadelphia, Pennsylvania.

MCCAFFREY, EDWARD V., File Manufacturer, McCaffrey File Company, Fifth and Berks Streets, Philadelphia.

McCALL. JOSEPH B., President, Philadelphia Electric Company, 1000 Chestnut Street, Philadelphia, Pennsylvania.

McCALL. RICHARD C., 2115 Locust Street, Philadelphia, Pennsylvania.

MCCHESNEY, JOHN M., General Manager, Keystone Leather Chemical Company, 150 West Central Avenue, Moorestown, New Jersey.

MCCLELLAND, GEORGE W., Instructor in Mathematics, 3112 Troost Avenue, Kansas City, Missouri.

MCCONNELL. FRANKLIN P.. in care of Day and Zimmermann, Incorporated, 1600 Walnut Street. Philadelphia, Pennsylvania.

McCONNELL, JACOB Y., Mechanical Engineer, 100 S. 4th Street, Darby, Pennsylvania.

McCORMACK, H., Professor of Chemical Engineering, Armour Institute of Technology, Chicago, Illinois.

MCDONALD, HUNTER. Chief Engineer, N. C. & St. L. Ry. Company, 112 Terth Avenue, North Nashville, Tennessee.

MCFADDEN, GEORGE H., Merchant. 121 Chestnut Street, Philadelphia, Pennsylvania. MCGEORGE, PERCY 711 Bullitt Building, Philadelphia, Pennsylvania.

MCGOWAN J. Jr., Chief Chemist, Joseph Campbell Company, 32 N. Front Street, Camden, New Jersey.

MCILHENNY. JOHN D., 17th and Clearfield Streets. Philadelphia, Pennsylvania. McKAIG. W. WALLACE, Mechanical Engineer. Cumberland, Maryland.

MCKEEHAN. Dr. L. W.. Research Physicist, Western Electric Company, 463 West Street. New York City, New York.

MCLEAN WILLIAM L.. Publisher. The Evening Bulletin. Philadelphia. Pennsylvania. MCMEEKIN. Major C. W., 343 Rialto Building, San Francisco, California.

MCVEY, JOHN JOSEPH, Publisher & Bookseller, 1229 Arch Street. Philadelphia, Pennsylvania.

MacBAIN, D. R. Assistant General Manager, New York Central Railroad Company, Cleveland, Ohio.

MacBFTH. NORMAN, Illuminating Engineer, 227 West 17th Street, New York City, New York.

MacGREGOR. FRANK S., Development Department. E. I. du Pont de Nemours and Company, 452 Du Pont Building, Wilmington. Delaware.

MACKENZIE. K. G., Consulting Chemist. The Texas Company, 17 Battery Place, New York City, New York.

MacLEAN, GEORGE, President, Ives Inventions, 208 West 88th Street, New York City, New York.

MacLEAN. MALCOLM R., Mechanical Engineer, Haverford. Pennsylvania. MADEIRA. PERCY C., Coal Operator, North American Building, Philadelphia, Pennsylvania.

MAILLOUX, Dr. C. O., Consulting Engineer, 111 Fifth Avenue, New York City, New York.

MAITLAND, HAROLD T., Oil Chemist, Sharon Hill, Pennsylvania.

MAIZLISH, Dr. ISRAEL, Instructor in Physics, Lehigh University, Bethlehem,
Pennsylvania.
MALLINCKRODT, E., Jr., Manufacturing Chemist, Mallinckrodt Chemical Works,
St. Louis, Missouri.

MANWARING, ALBERT H., Electrical Engineer, The Philadelphia Electric Company, 1000 Chestnut Street, Philadelphia, Pennsylvania.

MARBAKER, Dr. EDWARD, Chemist, Mellon Institute, Pittsburgh, Pennsylvania.

MARCONI, GUGLIELMO, Senator, Electrical Engineer and Inventor, 31 Via Garibaldi Gianicolo, Rome, Italy.

MARKLE, A., Mining Engineer, Hazleton, Pennsylvania.

MARKLE, JOHN, Mining Engineer and Coal Operator, 2 Rector Street, New York City, New York.

MARSHALL, THOS. H., Carpenter and Builder, Carpenter's Hall, 320 Chestnut Street,
Philadelphia, Pennsylvania.

MARTIN, T. COMMERFORD, Advisory Secretary, National Electric Light Associa-
tion, 29 West 39th Street, New York City, New York, and for mail, 32 Grove
Avenue, Larchmont Manor, New York.
MARTIN, THOMAS S., 3rd, Civil Engineer, 7205 Cresheim Road, Germantown,
Philadelphia, Pennsylvania.
MARTOCELLO, JOSEPH A., Manufacturer Raw Water Ice Making Appliances, 229
North 13th Street, Philadelphia, Pennsylvania.

MASLAND, CHARLES H., 2nd, Chemical Engineer, 1202 Stratford Avenue, Melrose
Park, Pennsylvania.

MASLAND, CHARLES WILLIAM, Manufacturer, 3240 Amber Street, Philadelphia,

Pennsylvania.

MASON, CHARLES THOMAS, Electrical Engineer, President, Sumter Electric Company, Sumter, South Carolina.

MASON, SIDNEY, President, Welsbach Company, Gloucester City, New Jersey. MASON, W. P., Professor of Chemistry, Rensselaer Polytechnic Institute, Troy, New York.

MASTERS, Major FRANK M., Chief Inspector, 204 Locust Street, Harrisburg, Penr sylvania.

MAXFIELD, H. H., General Superintendent, Pennsylvania System, 402 Pennsylvania Building, Wilmington, Delaware.

MAYER, NELSON B., Merchant, Hotel Marie Antoinette, Broadway and 67th Street, New York City, New York.

MEASEY, WILLIAM MAUL, Attorney-at-Law, 1328 Chestnut Street, and for mail, Box 208, Haverford, Pennsylvania.

MEEKER, G. H., Professor of Chemistry, School of Medicine, University of Pennsylvania.

MEES, Dr. C. E. KENNETH, Director, Research Laboratory, Eastman Kodak Company, Rochester, New York.

MELCHER, WM. C., Jr., c/o I. P. Morris Department, William Cramp and Sons,
Ship and Engine Building Company, Philadelphia, Pennsylvania.
MELLOR, NORMAN, Manufacturer, Wayne Junction, Philadelphia, Pennsylvania.
MELODY, MICHEAL, Bailey Building, Philadelphia, Pennsylvania.
MENDENHALL, Dr. T. C., Retired, Ravenna, Ohio.

MERRICK, JAMES HARTLEY, Acting Vice Provost, University of Pennsylvania, and for mail, No. 20 Cleemann House, University Dormitories, Philadelphia, Pennsylvania.

MERRICK, J. V., Roxborough, Philadelphia, Pennsylvania.

MERRIMAN, THADDEUS, Department Engineer, Board of Water Supply, Municipal Building, New York City, New York.

MERRITT, JAMES SMITH, Mechanical Engineer, Abington, Pennsylvania.

MERSHON, R. D., Consulting Engineer, Electric Testing Laboratories, 80th Street and East End Avenue, New York City, New York.

MERZ, CHARLES H., Consulting Engineer, 32 Victoria Street, London, S. W., England.

MERZ, EUGENE, Manufacturer, The Heller and Merz Company, Hamburg Place.
Newark, New Jersey.

METTEN, JOHN F., Chief Engineer, Wm. Cramp & Sons, Ship & Engine Building
Company, Richmond and Norris Streets, Philadelphia, Pennsylvania.
METZ, HERMAN A., Manufacturer and Importer of Chemicals and Dyestuffs, 122
Hudson Street, New York City, New York.

MICHELSON A. A., Professor of Physics, University of Chicago, Chicago, Illinois.
MIDDLETON, ALBERT C., Director, 149 East Main Street. Moorestown, New
Jersey.

MILES, J. WALTER, Electrical Engineer, Irwin, Pennsylvania.

MILLER, CASPER W., Physician, Wallingford, Pennsylvania.

MILLER, FRED J., Factory Manager, New Hope, Pennsylvania.

MILLER, SIMON, Textile Manufacturer, 901 North 16th St., Philadelphia, Pa.

MILLER, W. LASH, Professor of Physical Chemistry, 8 Hawthorne Avenue, Toronto, Canada,

MILLIKEN, J., President, Pittsburgh Testing Laboratories, P. O. Box 115, Pittsburgh, Pennsylvania.

MILLS, GEO. M., President, Thomas Mills and Brothers, Incorporated, 1301 North 8th Street, Philadelphia, Pennsylvania.

MILNE, DAVID, Manufacturer, School House Lane, Germantown, Philadelphia, Pennsylvania.

MILNE, FRANCIS F., Jr., 1714 Spruce Street, Philadelphia, Pennsylvania.
MILNER, B. B., Engineer of Motive Power, Hartford, Kansas,

MINER, HARLAN S., Chief Chemist, Welsbach Company, Gloucester, New Jersey.