143 



-> MICROTOME 



THE ARM OF THE 

 -^ MICROTOME IS NOT IN 

 MOTION AT THIS 



> MICROSCOPE 



SHOOT /t^C- FORH/iRD 

 Fig. 262. Adjusting of the microtome for sectioning (continued). 



taken to ensure that its edge is parallel with the end of the trough. Tlie 

 latter, together with the knife, is then fixed in the microtome. At the same 

 time, the object-holder is tightly screwed into the mobile part of the 

 microtome. The screw controlling the thickness of the sections is adjusted 

 in accordance with the desired thickness. Concomitantly, a final adjustment 

 of the pyramid in relation to the knife should be made. The general condi- 

 tions of stability must also be observed, particularly a steady under-carriage. 

 This process, as well as that of cutting, is followed through a binocular 

 microscope ( x 20). 



