296 



Transactions of the Sonet//. 



Fig. 1 — Central cell of onion root. 

 Mitochondria only stained, no Golgi 

 apparatus. Short mordanting with 

 chrom-osmic mixture on slide. 

 Iron-alum hsematoxylin. x 1300/1, 



Fig. 3. — Cell midway between centre 

 and surface of onion root. Long 

 mordanting with chrom-osmic mix- 

 ture. A few mitochondria and 

 delicate and coarse Golgi elements. 

 X 1800/1. 



Fig. 2. — Central cell of onion root» 

 Long mordanting with chrom-osmic 

 mixture. No mitochondria : Golgi 

 apparatus long and short filaments 

 forming a dense network around 

 nucleus and scattered filaments 

 throughout cytoplasm, x 1800/1. 



Fig. 4. — Surface cell of onion root. 

 Long mordanting with chrom-osmio 

 mixture. Granular mitochondria 

 and oval lenticular Golgi elements. 

 X 1300/1. 



