712 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



The elevation of the slide as it is pushed forward can be read off on a 

 scale on the vertical plate and a nonius. 



The knife o is attached to a slide / (Fig. 136), which has an 

 eccentric disk g on its upper surface. By turning this disk the knife, 



Fig. 135. 



which is fixed by the clamp-screw i, can be brought into any desired 

 position. 



There is one defect in all sliding microtomes, which consists in 

 the tendency of the knife, when fastened only at the handle, to give 



Fig. 136. 



way at the free end of the blade on any resistance in the object. This 

 defect is remedied by the metal bow h, the slit end of which passes 

 through the axial screw h, while the front portion is attached to the 

 knife by the screw p, by which means any displacement of the end 

 of the blade is prevented. 



Marsh's Section Knife.* — It is frequently suggested that the 

 surface of the knife which has to glide along the cutting-plate of the 

 * 'Microscopical Section-cutting,' 2ml editioD, 1882, pp. 32-3 (2 figs.). 



