activity. The self-diffusion of lead and the exchange of lead atoms between solid lead and a saturated solution of a lead salt, the interchange of atoms in solutions of different salts of the same metal and similar problems have been studied by von Hevesy,1 Gróh-von Hevesy, von Hevesy-Róna and von Hevesy-Zechmeister. Adsorption and adsorbing surfaces were studied by this method by Freundlich-Neumann-Kaempfer, FreundlichWreschner, Lachs-Herszfinkel, Paneth and Paneth-Vorwerk.

Lawson predicted the existence of a polonium hydride from his study of the range of a-particles from RaF (84RaIII) in hydrogen. Using the method of radioactive indicators this hydride was proved to exist and similarly hydrides of lead and bismuth, all gaseous at ordinary temperatures, were discovered and studied by Paneth,2 Paneth-Winternitz, PanethNörring, Paneth-Johannsen and Paneth-Johannsen-Matthies. The method was used by von Hevesy 2 to study the absorption and translocation of lead by living plants and by Lomholt and Christiansen-von HevesyLomholt to study the amounts of bismuth (later also of lead) carried to various organs of an animal by digestive and circulatory processes. Radioactivity has also been used in tracing finely divided precipitates (using Tn (86Th) as the activating agent) by Hahn; and in studying the disintegration of metals by a-particles (Lawson 2). In these cases, however, isotopy is not involved, the radio-element being mechanically held or adsorbed upon the material to be traced.

7b. MISCELLANEOUS APPLICATIONS

Applications of radium in warfare are discussed by Viol-Kammer; its use in making recording devices, by Powell. Ehrenhaft-Konstantinowsky have used radioactive test bodies in experiments to test the indivisibility of the electronic charge. Swann-Mauchly have studied the "radioactive cells" used for high resistances (Bronson).

Measuring instruments or methods, besides those already mentioned, have been discussed by Barratt, Mukerjee, Horton, Shimizu, Szilard, Elsey, Folmer and Owen.

Technical applications of radium, besides those already noted, have been so varied and the claims made are in many cases so extravagant that no review of the patent and other literature in this connection has been deemed advisable.

TABLE VIII

H-PARTICLES FROM ATOMIC NUCLEI BOMBARDED BY ALPHA-PARTICLES FROM

AUTHOR INDEX

Page numbers (this report) are in bold-faced type. If more than one reference is made to the same page, the separate references are distinguished by superscripts. The asterisk indicates papers appearing since June 30, 1924. For further details see pages 5 and 6.

AARTOVAARA, G. A.

Annales acad. scient. fennicae (Helsingfors) 3A: no. 5, 4 pp. (1912) 136

ADAMS, E. Q.

J. Amer. Chem. Soc. 42: 2205 (1920) 19

AGUIAR, H. D. d'.

Chem. Met. Engg. 25: 825, 877 (1921) 14

AHMAD, N.

Proc. Roy. Soc. 105A: 507 (1924) 103, 106, 107, 110, 115

and STONER, E. C.

Proc. Roy. Soc. 106A: 8 (1924)* 106, 107, 110

AKIYAMA, M.

Japanese J. Phys. 2: 279 (1923) 156
Ibid. 2: 287 (1923) 156, 160
see also Kinoshita, S.

ALBRECHT, E.

Wien. Ber. 128IIa: 925 (1919) 16, 17, 21, 24, 154

ALLEN, H. S.

(M.-S.) 126

ALLEN, N. B. C.

Proc. Roy. Soc. Victoria 30: 142 (1918) 76 ALLEN, S. J.

(M.-S.) 139

ALLISON, S. K., and HARKINS, W. D.

J. Amer. Chem. Soc. 46: 814 (1924) 133

ANDERSSON, H.

see Svedberg, T.

ANDRADE, E. N. DA C.

ZS. f. Phys. 22: 345 (1924) 153

see also Rutherford, E.

ANGELINO, G.

see Francesconi, L.

ANSLOW, G. A.

Science (N. S.) 60: 432 (1924)* 78, 80

and HOWELL, J. T.

Proc. Nat. Acad. Sci. 3: 409 (1917) 15 ARONBERG, L.

see Harkins, W. D. ARTNER, M.

Wien. Ber. 130 IIa: 253 (1921) 56 ASTON, F. W.

Sub-atomic phenomena and radioactivity, Chem. Soc. (London) Annual Rep. 19: 267-288 (1922) 6 Nature 113: 393 (1924) 26, 124 Isotopes, Arnold, London (1922) 157

BAXTER, G. P., BRAUNER, B., DEBIERNE, A., LEDUC, A., RICHARDS, T. W., SODDY, F., and URBAIN, G. Report of the International Committee on Chemical Elements, 1923, J. Amer. Chem. Soc. 45: 867874 (1923) 6, 29

ATKINSON, R. H.

Nature 112: 282 (1923) 27

Ibid. 113: 495 (1924) 27

AUGER, P., and PERRIN, F.

Comptes Rendus 175: 340 (1922) 64,
156

AVERSENQ, DELAS, JALOUSTRE, L., and
MAURAIN.

Comptes Rendus 178: 1321 (1924)
167

BAERWALD, H.

Bericht über Lumineszenzerregung durch Kanalstrahlen, Jahrb. d. Rad. 16: 65-95 (1919) 6

Ann. d. Phys. (4) 60: 1 (1919) 60

Ibid. (4) 65: 167 (1921) 60

Ibid. (4) 70: 255 (1923) 60