94 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



in closely rolled clumps. The leaves soon perished, and growth 

 ceased. • The rootstocks remained alive however and might have 

 been caf)able of another effort under proper cultural conditions. 



Fig. 50. Etiolated cultures of Cicutn maculata. 



The above reactions were practically duplicated in tests with 

 Thaspium trifoliatwn grown in small dark chambers at the Uni- 

 versity of Minnesota in 1898 and 1899, and all umbelliferous species 

 behave in this manner so far as my observations extend. 



Claytonia Virginica L. 

 Tubers of Claytonia placed in the dark room in April, at a time 

 when natural growth of the buds was taking place, did not show 



