The human brain : histological and coarse methods of research : a manual for students and asylum medical officers . f which, however, condenses on the bottom, and isconveyed off by the bent tube into a bottle attached to it. Ihave found it convenient to have the zinc cylinder quite21 inches wide by Ih inches deep, and the aperture in the sideof the instrument f-inch in diameter. The cap or plate closing the cylinder above, I term thefreezing plate, and upon it rests the tissue, whilst the etherspray plays upon the plate from below. The freezing-chamber is thus rapidly reduced in temperature, a
The human brain : histological and coarse methods of research : a manual for students and asylum medical officers . f which, however, condenses on the bottom, and isconveyed off by the bent tube into a bottle attached to it. Ihave found it convenient to have the zinc cylinder quite21 inches wide by Ih inches deep, and the aperture in the sideof the instrument f-inch in diameter. The cap or plate closing the cylinder above, I term thefreezing plate, and upon it rests the tissue, whilst the etherspray plays upon the plate from below. The freezing-chamber is thus rapidly reduced in temperature, and to pre-vent conduction by means of the section-plate, it is well tohave a free interval all around the freezing cylinder, securingit from actual contact with the section-plate. 94 MINUTE EXAMINATION OF THE BRAIN. c. The Section-Plate.—This is made either of metal or ofplate-glass, drilled with a central aperture, through which thefreezing chamber glides. If of metal, it should, by prefer-ence, be made of a smooth, polished zinc plate, about -f -inchthick, supported by strong vertical arms upon the body of. Fia. 9.—TnE Ether Freezing Microtome. (New Form.) tlie instrument. I would strongly advocate the use of theplate-glass, since it renders the movements of the knife abso-lutely free and easy; whilst, on the other hand, the bladenever gets injured from scratches, which, sooner or later,invariably appear upon a metal section-plate, and wliich turnor indent the edge. MICROTOMES FOR FREEZING. 95 To recapitulate—the various divisions of our microtome areas follows:— a. The body, comprising the well, the piston,and the micrometer-screw. h. The freezing chamber, fitted with sloping false-bottom, an exit-tube, and capped by the freezingplate. c. The section-plate, drilled for the passage of the freezing chamber. The Freezing Medium.—The best anaesthetic ethershould be employed. I find it more economical thanmethylated ether. The ordinary Richardson ether spray isthe more
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