. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 132 PRACTICAL TREATISE ON THE MICROSCOPE. which a new cover can be adapted with little trouble; the tubular top is provided with a screw, upon the edge of which the cover of thin glass or mica is laid, over this a cap is screwed to keep the cover firm. Fig. 84 represents the tubular top, with its screw cap, and fig. 85 a section of the entire. Fig. 85. Fig. 84. instrument, A B being the flat support, c the object-pla
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 132 PRACTICAL TREATISE ON THE MICROSCOPE. which a new cover can be adapted with little trouble; the tubular top is provided with a screw, upon the edge of which the cover of thin glass or mica is laid, over this a cap is screwed to keep the cover firm. Fig. 84 represents the tubular top, with its screw cap, and fig. 85 a section of the entire. Fig. 85. Fig. 84. instrument, A B being the flat support, c the object-plate or tablet, d the channel around the same, b the tubular top with its screw-cap, e, holding down the thin glass cover, a. When the glass cover is of tolerably stout glass, these cages, besides being only employed for animalcules, may be used for com- pressing such objects as are soft, but still too opaque to be seen through. When these are moderately compressed, their structure is readily made out; but an instrument constructed for this purpose especially, and known as the Compressorium, will be presently described. To use these animalcule cages, all that is necessary is to place a small quantity of the fluid containing the animalcules upon the object-plate or tablet, and to slide the cover carefully until the drop is flattened out to the required degree of thin- ness; this should never exceed the size of the tablet itself. When the drop of fluid is made flat, the objects it contains may not only be viewed with great ease and convenience, but they may be carried about and kept for some considerable time under observation; the capillary attraction will preserve the fluid between the two glasses, and no shaking or turning that is not sudden will injure them in the least. When more fluid than is necessary is placed upon the bottom glass, the excess will escape into the channel, and, in all Please note that these images are extracted from scanned page images that ma
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