INVERTEBTIATA, CRYPTOGAMIA, MICROSCOPY, ETC. 



335 



movable piece c is made to approach to or recede from d, so that a 

 more couvenicnt and secure fixing of the object is obtained. By 

 means of the bent arm e the clamp is attaclied to the block / (the 

 upper surface of wliich is rounded), to which it can be secured by 

 the screw g. When the latter is loosened the clamp can be moved 

 through a small arc in a plane parallel to the middle plate of the 

 instrument, and so set in an oblique position. The block f is con- 

 nected with a second (fixed) block h by a screw passing through 

 the latter, and can be secured to it by i, or when the screw is 

 loosened /, with e and the clamp, can be rotated in a plane at right 

 angles to the middle plate and placed in the oblique position shown in 

 the figure. 



By the combination of these two movements the object can be 

 placed in any desired position, and, as they act indei)endently, there is 

 no danger that in correcting the position in one direction the other will 

 be interfered with. For cleaning the block h can be sejiaratcd from 

 the carrier by loosening the screw I. 



Fm. 2G. 



J 



Several clamps can be used witli one microtome, which is very 

 useful in lurge lahoraturies. 



Till) secDiid iiiiproveineut is in th»! Construction of the knifc-carritn- 

 (Fig. 20). Tn (ibviatf tbc tendency of tlic knife t<» be more dcprcssml 



