1090 



SUMMARY OF CUERENT RESEARCHES RELATING TO 



whicbi bears against a projecting flange on the upper end of the 

 V-bed, so that no matter how hard the material may be, the knife 

 moves steadily through it without deviating from its plane or re- 



FiG. 25o, 



quiring any extra pressure. The upper surface has a grooved slot to 

 which is fitted a sliding thumb-screw so that the knife may be fastened 

 at any point. The object-holder has a clamp for holding hard 

 specimens, and a cup which is quickly attached for imbedding soft 

 ones. 



Fig. 256. 



^ ' For ether freezing a nickel-plated cylinder with atomizer (fig. 256) 

 is fastened in the clamp. 



