PLATE 4 
EXPLANATION OF FIGURES 
16 Culture 613. Endothelial cell from liver, 7-day chick embryo; 5-day cul- 
ture. Mitochondrial vesicles, degeneration vacuoles, large centrosphere, 
cytoplasmic striae. Janus green, neutral red, iodine. X 1450. 
17 Culture 612. Endothelial cell from liver, 9-day chick embryo; 3-day 
culture. Marked striation of cytoplasm. Janus green, neutral red, iodine. 
x 1030. 
18 Culture 716. Endothelial cell from liver, 8-day chick embryo; 6-day 
culture; pH 7.4. Branching mitochondria. Janus green, iodine. X 1450. 
19 and 20 Culture 666 (same culture as figs.5 and 6). Endothelial cells from 
liver, 5-day chick embryo; 4-day culture. Fig. 19, mitochondrial granules 
and vesicles, large centrosphere. Fig. 20, mitochondrial threads, rods, 
granules, large centrosphere. Janus green, iodine. X 1450. 
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