. Pathological technique; a practical manual for workers in pathological histology and bacteriology. Fig. 4.—Minot precision microtome (Bausch & Lomb). to the elaborate Schiefferdecker-Becker microtome, designedfor cutting sections under alcohol. A new and wholly original microtome, in which the knife 24 PATHOLOGICAL TECHNIQUE. remains fixed and is clamped at both ends, while the object-holder, which is raised by a screw, moves back and forthbeneath the knife, has recently been designed by Dr. C. and is manufactured by Bausch & Lomb (Fig 4).It is intended both for celloidin and for par
. Pathological technique; a practical manual for workers in pathological histology and bacteriology. Fig. 4.—Minot precision microtome (Bausch & Lomb). to the elaborate Schiefferdecker-Becker microtome, designedfor cutting sections under alcohol. A new and wholly original microtome, in which the knife 24 PATHOLOGICAL TECHNIQUE. remains fixed and is clamped at both ends, while the object-holder, which is raised by a screw, moves back and forthbeneath the knife, has recently been designed by Dr. C. and is manufactured by Bausch & Lomb (Fig 4).It is intended both for celloidin and for paraffin work. A drop-bottle on an elevated stand, with screw arrange-ment for regulating the amount of alcohol, is the most con-venient method for keeping the object and the knife wetwhile cutting; 80 per cent, alcohol should be used. Paraffin Microtome.—Although paraffin sections can becut on a celloidin microtome, it is preferable to have aninstrument designed for the purpose. Two models of the. Fig. 5.—Minots wheel microtome (Bausch & Lomb). Minot wheel microtome are manufactured in this country:one by the Bausch & Lomb Optical Co., the other by theInternational Equipment Co., of Cambridge, Mass. Thelatter instrument has this advantage for pathological work:it is simple and heavy in construction, and the paraffin block-holder is controlled by a ball-and-socket joint, requiring butone screw instead of three. It has been found very satisfac-tory in practical use. Paraffin Bath.—The best bath for keeping paraffin at aconstant temperature is a thermostat of suitable size withhot-water jacket, such as is used for growing cultures of HISTOLOGICAL METHODS. 25 bacteria. The paraffin is kept in it on shelves in glass dishesof various sizes. The advantages of this method over theold way of using copper cups set into the top of a water-bath are that the paraffin is kept absolutely free from dust,each worker can have his own set of dishes, and the smallestbits of tissue can
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