206 



Plant Tissue Culture 



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Pig. 61. Above, successive stages (left to right) in the hyper- 

 hydric enlargemenl of the integuments of immature seeds of Antir- 

 rhinum upon cultivation in hanging drops of nutrient. These large, 

 thin-walled callus cells furnish excellent material in which to ob- 

 serve the details of cellular behavior. ■ '.W. ( From White, P. E. 

 1932. Arch. exp. Zellforsch. LI: 615, figs. 1 I. is. 19,89.) Below, 

 single cells from the margins of hanging drop cultures of immature 

 seeds of Antirrhinum showing the nucleus, protoplasmic strands, 

 |. last. .is, oil globules, etc. < 250. (Prom White, P. R. 1932. 

 Arch. exp. Zellforsch. 11 : 617 and 619, figs. 2] and 23, 89.) 



