18 



STUDENTS HISTOLOGY 



the reverse of that employed for honing. The motion is from toe 

 to heel, the back of the knife preceding the edge. Fig. 10, with 

 the arrow reversed, illustrates the movement. 



SUPPORTING TISSUES FOR CUTTING 



Frequently small bits of tissue are required to be cut pieces 

 too small to be held with the fingers. We are in the habit of 



FIG. 12. INSTRUMENT FOR SOLDERING TISSUE TO CORK SUPPORTS WITH PARAFFIN. 



It consists of an awl-handle of wood into which a short piece of wire, preferably copper, is 

 driven and bent as shown. 



cementing such tissues into a hole in a bit of ailantus- or elder - 

 pith, when the whole may be cut as one mass. Tissue is fre- 

 quently cemented to cork for convenience of holding in free-hand 



FIG. 13. METHOD OF CEMENTING TISSUE TO A CORK SUPPORT WITH PARAFFIN. 



cutting ; or the cork may be held in the vise of the microtome. 

 The edge of the knife should not be allowed to touch the cork. 

 Fig.. 12 shows a simple little instrument, very convenient for 



