838 



SUMMARY OF CURIiENT RESEARCHES RELATING TO 



fri^zon upon a zinc plate A connected with metallic pillars, which are 

 sniTonnclcd by a freezing mixture, as in the Williams microtome. In 

 order that the plate may bo quickly and effectively cooled to a tem- 

 perature sufficient to freeze a tissue placed upon it, it is put in con- 



nection, not with one, but with twelve pillars, which rest upon the bottom 

 of the freezing-box D, and are in close metallic contact with the plate. 

 In order to further increase the effect of the freezing mixture, the pillars 

 are made of a cruciform shape in their transverse section, as shown in 

 fig. 154. The freezing mixture of ice and salt is passed between the 



