530 



Proceedings of the Royal Physical Society. 



piece of tissue may be fused, and kept ready for cutting at 

 any time. Then, too, the die with its piece of tissue may be 

 unscrewed, after a few sections have been cut, and another 

 substituted ; the fixing screw enables one to adjust the 

 holder and tissue as required. 



To a large Schanze microtome, which is used principally 

 for cutting tissues embedded in celloidin, an arrangement 

 has been fitted (Fig. 10) to allow of sections being cut under 

 spirit. To the knife block that runs in the groove I have 

 affixed a second bevelled plate, so adjusted that it throws down 

 the point of the knife about 2 inches. This bevelled block is 



Fig. 10. 



(a) Tissue holder ; (6) razor ; (c) steadying clamp ; {d) waste pipe for 

 tray ; (e) ditto for bag ; (/) raising screw. 



sufficiently long to carry both the knife (h) and the steadying 

 clamp (c) that runs to the end of the blade. It will be evident 

 that the knife will not run parallel to the ground, but 

 somewhat obliquely. To the body of the microtome there 

 is fixed by movable clamps a nickelled copper tray, 

 only about \ inch deep where it is attached, but 

 2\ inches deep at its outer part. In the bottom of the tray 

 there is a rounded opening 5 J inches in diameter, through 

 which the specimen clamp {a) passes. The space between the 

 margin of the opening and the rod supporting the clamp is 



