The microscope : and its application to vegetable anatomy and physiology / by Dr. Hermann Schacht ; edited by Frederick Currey, M. A.

Hermann Schacht

Date:: 1855

Credit: The microscope : and its application to vegetable anatomy and physiology / by Dr. Hermann Schacht ; edited by Frederick Currey, M. A. Source: Wellcome Collection.

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$with the sini2)le niicrosco]>e. The height of the rests mxist be regulated accox'diiig to the height of the stage of the dissecting microscope. —This is represented in fig. 48. It is nothing more than a piece of plate-glass, with a rim or ledge cemented at the bottom; it is used when objects ai‘e examined in fluid, for the purpose of preventing the fluid from rmming over the stage when the microscope is inclined. If sidphuric acid or any bitixig or corrosive re-agent is used, the ledge shoidd be fastened to the plate-glass with gold rivets, as the cement is dissolved by the acid, and the ledge becomes detached. —My friend Mr. Spencer, of Blackheath, has recom- mended the apparatus shewn in fig. 49, for cleaning thin glass. It is very diflicidt to handle gla.ss which is less than about the l-150th of an inch thick, wdthout breaking it. The disks shewn in fig. 49, may be made of wood or metal. Their surface is covered with chamois leather. If a piece of even the thin- nest glass be placed on one of the disks, it may be rubbed clean with the other, and any amount of pressiu’e may be exerted without risk of breaking it. Section iiistriuiient—This is represented in fig. 50. It consists of a piece of cylimbical brass tubing open at the top, and closed at the bottom; a brass cbsk is fitted inside the cylinder, and is capable of being moved \ip and do^vn the whole length of the tube by the screw at the bottom. Into this tvibe is pushed a very soft, perfect cork, which has been divided longitudinally almost to the bottom with a sharp knife. The object from wdiich it is wished to take a thin section is$