2462 



Journal of Applied Microscopy 



(B. ^: L. Opt. Co. Cat. No. ls34), with adjustable partition, wedge and spring; 

 15 is a compressor (B. tlv: L. Opt. Co. Cat. No. 12()4),with the author's modifica- 

 tions for making it into cells of different depths and shapes; Ki is a cell with 

 polished plate glass faces two and a half inches high by one and three-eighths 



inches wide and open at the top ; 17 is similar to 16 but is lower, deeper from 

 front to back, and is cemented to a slide ; 18 and 19 are open ring cells made 

 by cutting out a section of a glass ring (B. & L. Opt. Co. Cat. No. 1250), cement- 

 ing the open ring on a plate glass slide which forms the back of the cell while 



