F. W. WENT 297 



vein growth, the leaf shape can be explained by the phyllocaline- 

 caulocaline balance. Hardly any new data concerning caulocaline have 

 been collected. Parallelisms between caulocaline and florigen are pointed 

 out in that both are translocated inside the plant only through intact 

 vascular connections, and both have defied most of the attempts at 

 isolation. 



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