ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



115 



edge. Figs. 19 and 20 illustrate two models, which differ principally 

 in the design of this mechanism for holding the razor. The movement 

 to and fro of the microtome-stage is controlled by the lever g. The 



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thickness of sections is determined by the adjustment of the lever h, 

 which can be moved along the index shown in the lower part of fig. 19. 

 The substage mechanism also allows of free movement of the stage up 

 and down, so as to bring the block into the proper position for cutting. 



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