154 



H. J. Arnott 



The crystallopkstids are often constricted into segments connected by a narrow isth- 

 mus. These plastids appear to degenerate as the crystal cells mature. The plastids do 

 not give an electron diffraction pattern. 







CI/ 



Transection of a crystal idioblast ,„ /,..„,, .„,„,„, a series of paired membranes wuhin the crystal 

 . are m the process of chamber formuu.,,. KM„0, fixation; post stained w.th uranyl acetate and lead 



citrate 



