PLATE 1 
EXPLANATION OF FIGURES 
1 Culture 708. Subcutaneous tissue, 8-day chick embryo; 2-day culture; 
pH 7.6; janus green, iodine. X 146. 
2 Same culture. X 480. 
3 Culture 667. Endothelium from liver, 7-day chick embryo; 3-day culture; 
janus green, iodine. X 146. 
4 Same culture. X 480. 
5 Culture 666. Endothelium from liver, 5-day chick embryo; 4-day culture; 
pH 6.5; janus green, iodine. X 146. 
6 Same culture. X 480. 
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