ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



889 



higher than the upper part of the slide-ways G T, M K. The lower 

 part of the carrier which runs in the groove (a b c and def) is dove- 

 tailed to fit. The knife is fixed by two thumb-screws, which go 

 through the slits in the cross-bars of the slide, and on its lower end 

 is a clamping plate e with a knob at one end 8. The object of this 

 projection is to prevent the plate from getting broken by over- 

 screwing up the knife. This consists of a strong handle 7 mm. 



Fig. 185. 



gKS^M 



thick, of a broad blade ground like a scalpel, and which for the 

 reception of fluid has a groove £ near the back. On the upper part 

 of the blade is a kind of second handle r), which, like the first, serves to 

 fasten the knife by means of the clamp, and though of the same 

 thickness, is only 3 cm. long. After raising the two thumb-screws 0, 

 the knife can be easily removed from the carrier and sharpened like 

 an ordinary razor. 



