How to work with the microscopeLindsay and Blakiston, 1865 - 272 Seiten |
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Seite 54 - Creosote, 3 drachms; wood naphtha, 6 ounces ; distilled water, 64 ounces ; chalk, as much as may be necessary. Mix first the naphtha and creosote ; then add as much prepared chalk as may be sufficient to form a smooth, thick paste ; afterwards add very gradually a small quantity of the water, which must be well mixed with the other ingredients in a mortar. Add two or three small lumps of camphor, and allow the mixture to stand in a lightly-covered vessel for a fortnight or three weeks, with occasional...
Seite 110 - In order to prove the point satisfactorily it was obviously necessary to inject the ducts to their minute extremities, which no one, as far as I was able to ascertain, had succeeded in doing satisfactorily. After death the minute ducts of the liver always contain a little bile. No force which can be employed is sufficient to force this bile through the basement membrane, for it will not permeate it in this direction. When any attempt is made to inject the ducts, the epithelium and mucus, in their...
Seite 48 - It is prepared by dissolving, separately, equal parts of shell-lac and India-rubber, in coal or mineral naphtha, and afterwards mixing the solutions thoroughly with the application of heat. It may be rendered thinner by the addition of more naphtha. Marine glue is readily dissolved by naphtha, ether, or solution of potash.
Seite 111 - ... of an inch in diameter, to their termination in the common duct, and much of the thick layer of epithelium lining their interior was washed out at the same time. The water was removed by placing the liver in cloths with sponges under pressure for twenty-four hours or longer. All the vessels and the duct were then perfectly empty and in a very favourable state for receiving injection. The duct was first injected with a coloured material. Freshly precipitated chromate of lead, white lead, vermilion,...
Seite 126 - Nitrate of Barytes. — A cold saturated solution of the salt forms a test solution of convenient strength. It should be filtered before use. A solution of nitrate of barytes is employed as a test for sulphuric and phosphoric acids. The precipitated sulphate of baryta being insoluble both in acids and alkalies; while the phosphate of baryta is readily soluble in acids, but insoluble in ammonia.
Seite 48 - Gold Size is prepared by melting together gum animi, boiled linseed oil, red lead, litharge, sulphate of zinc, and turpentine. Gold size adapted for microscopical purposes may be also prepared as follows :— 25 parts of linseed oil are to be boiled with one part of red lead, and a third part as much umber, for three hours. The clear fluid is to be poured off and mixed with equal parts of white lead and yellow ochre, which have been previously well pounded. This is to be added in small successive...
Seite 108 - The ferrocyanide of potassium is to be dissolved in one ounce of the water, and the tincture of sesquichloride of iron added to another ounce. These solutions should be mixed together very gradually, and well shaken in a bottle. The iron being added to the solution of the ferrocyanide of potassium. When thoroughly mixed, these solutions should produce a dark blue mixture, in which no precipitate or flocculi are observable. Next, the...
Seite 34 - I o say a few words upon the magnifying power of the different lenses. Although the several object-glasses are termed one inch, one quarter of an inch, one eighth, &c., the magnifying power of each is not definite, and the quarters of some makers magnify many times more than those of others. It is well, therefore, that every observer should be able to ascertain for himself the magnifying power of his different glasses. Suppose I wish to know how much this French quarter magnifies. The...
Seite 11 - In using this microscope the slide with the object to be examined is placed upon the stage, the thin glass being upwards towards the object-glass, while the spring is made to press upon the under surface of the slide. The little screw is removed. The slide may now be moved in every position, and any particular object to be examined can readily be placed exactly under the object-glass. Tube a is withdrawn about two thirds of its length.
Seite 48 - Common Brunswick black is made by melting one pound of asphaltum, and then adding half a pound of linseed oil, and a quart of oil of turpentine. The best Brunswick black is prepared by boiling together a quarter of a pound of foreign asphaltum, and four and a quarter ounces of linseed oil, which has been previously boiled with half an ounce of litharge until quite stringy ; the mass is then mixed with half a pint of oil of turpentine, or as much as may be required to make it of a proper consistence....