THE REVOLVING APPARATUS 35 



they may be suspended, while samples are under 

 examination. If the capillary tubes containing the 

 specimen are laid for some time on the table, the 

 corpuscles will sink to the most dependent part of 

 the citrate solution, and will ultimately adhere to the 

 glass. By placing the tubes in the "revolving appa- 

 ratus" this is effectively prevented. It is a good thing 

 to have in the laboratory, for it delays loss of vitality 

 in the cells; but it is not essential. 



