. The microscopic anatomy of the human body in health and disease (Volume 2). eof black silk or common court-plaster pasted on. In default of this form of trough, any small vessel of glass, porcelain, ormetal may be employed; a small evaporating-dish answers extremely it is necessary to observe the object by means of transmitted light, ofcourse only a glass trough will answer the purpose. One larger trough,four or six inches square, having a piece of flat cork half an inch thick,(covered with black cloth, if desired,) and secured to the bottom by means ofthe marine glue, or the compoun
. The microscopic anatomy of the human body in health and disease (Volume 2). eof black silk or common court-plaster pasted on. In default of this form of trough, any small vessel of glass, porcelain, ormetal may be employed; a small evaporating-dish answers extremely it is necessary to observe the object by means of transmitted light, ofcourse only a glass trough will answer the purpose. One larger trough,four or six inches square, having a piece of flat cork half an inch thick,(covered with black cloth, if desired,) and secured to the bottom by means ofthe marine glue, or the compound cement, so that the tissue under dissec-tion can be fastened with pins to the cork, will be found especially this form of trough, dissections of entire insects, such as beetles, commoncockroaches, &c, can be carried on. 6. The Compressor.—This is an instrument by means of which pressuremay be applied at will to an object under examination with the microscope;various forms are in use, but the simplest and most effectual is the one repre-sented in figure 5:. Fig. 5. PREPARATION OF OBJECTS. 37 This instrument consists of a plate of brass, three or more inches long and oneand a half broad, having in its middle a circular piece of plate-glass for an object-holder; this is slightly raised above the metal plate; at one end of the latter is acircular piece of brass, having attached to it another piece of brass, carrying an armcapable of being moved up and down, by means of a screw at one end, while at theother is a semi-circle, supporting by screws a ring of metal, to the under side ofwhich, a piece of thin glass is cemented. * The use of the instrument is to produce a pressure upon the objectbetween the plates of glass while being examined with the microscope; thecompressor being placed upon the stage of the instrument. The object isplaced upon the under plate of glass, the arm being made to turn away forthat purpose. 7. Pipettes.—These are fine glass tubes, about eigh
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