ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 105 
^ ^ SCre ' V bas beon fed "P t0 its greatest 
right, ^ when a small t* 7 1 brmgll ?o tlie a °tuating lever to the 
lever) engages the teeth of shown m fi S" r0 because beneath the 
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—■ * oL rjiii x 
Fig. 21. 
pivoted around the axis of the feed, and movable by means of the l„v 
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*35SW ,r,ii*4f:; P t fstbrj 0 t *■ »- 
its 
