Identifier: plantanatomyfrom00stev (find matches)
Title: Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic
Year: 1910 (1910s)
Authors: Stevens, William Chase, 1861-
Subjects: Botany -- Anatomy
Publisher: Philadelphia, P. Blakiston
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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FIG. 142.—Showing the manner of holding the knife blade on the glass ways, and, by thearrow, the direction of sliding the knife while cutting the sections. Care of the Section Knife.—As has been said, and it willbear repeating, the section knife or razor must be kept sharp—what we call perfectly sharp, or as sharp as one can make it.The test is that it should clip a hair at a slight touch. If itwill not do this it may need honing on a stone and then strop-ping on leather, or the stropping may be all that it needs. Totell what to do moisten the ball of the thumb and draw it lightlyover the edge of the knife from tip to heel; if the edge gives the 256 PREPARATION OF SECTIONS sensation of taking hold of the skin throughout its length onlystropping is needed, but if not, the knife must be honed.
Text Appearing After Image:
beC •C 0) c. CS _ £ u E 2 MC Before honing or stropping a microtome knife a steel backshould be slipped on it so as to tip the edge to the proper angle. CYTOLOGICAL METHODS 257 but an ordinary razor will not need this back. While honinghold the knife in the position shown in Fig. 144, keeping theback as well as edge against the stone, and while pushing theknife edge foremost slide it at the same time from point to heelas shown by the arrow. Then turn the other face of the knifeto the stone and repeat the stroke from point to heel toward theother end of the stone, and so on until the thumb test above de-

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