. The microscope; an introduction to microscopic methods and to histology. Microscopes; 1899. 192 PHO TO-MICROGRA PH}'. \_CH. VIII. niteness may be readily obtained. Stained microbes also furnish favorable objects when mounted as cover-glass preparations. Preparations in animal histology mii'it approximate as nearly as possible to the conditions more easily obtained with vegetable preparations. That is, they must be made so thin and be so prepared that the cell outlines will have something of the defiiiiteness of vegetable tissue. It is useless to expect to get a clear photo- graph of a sectio
. The microscope; an introduction to microscopic methods and to histology. Microscopes; 1899. 192 PHO TO-MICROGRA PH}'. \_CH. VIII. niteness may be readily obtained. Stained microbes also furnish favorable objects when mounted as cover-glass preparations. Preparations in animal histology mii'it approximate as nearly as possible to the conditions more easily obtained with vegetable preparations. That is, they must be made so thin and be so prepared that the cell outlines will have something of the defiiiiteness of vegetable tissue. It is useless to expect to get a clear photo- graph of a section in which the details are seen with difficulty when studying it under the microscope in the ordinary way. Many sections which are unSRtisfactory as wholes, may nevertheless have parts in which the structural details show with satisfactory clearness. In such a case the part of the section showing details satisfactorily should be surrounded by a delicate ring by means of a marker (see Figs. 61-66). If one's preparations have been carefully studied and the special points in them thus indicated, they will be found far more valuable both for ordiinrv demonstration and for photography. The amount of time saved by marking one's specimens can hardly be overestimated. The most satisfactory material for making the rings is shellac colored with an alco- holic solution of one of the anilins, blue or green, then in studying the prepara- tion one can see it even where covered by the ring. Fig. 147. ll'almsley's Autograph Photo micrographic Camera in a horizontal position. A microscope lamp and bull's-eye condenser are in position. Compare Fig. //S in (Proc. Amer. JMicr. Soc, Vol. XVII, 1S95). \ 333. Light.—The strongest available light is sunlight. That has the defect of not always being available, and of differing greatly in intensity from hour to hour, day to day and season to season. The sun does not shine in the evening when. Please note that these images are extracted from scanned pa
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