148 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



single pair of leaves being about 6 cm. long, with recurved apex. 



The stalks were generally more or less compressed and flattened. 

 In other tests the terminal portions of large plants were conducted 



into small dark chambers to secure " partial " etiolations. Branches 

 treated in this manner developed flowers which were 

 fairly normal, except that they were blanched. The 

 essential organs were perfect, and fertilization en- 

 sued, pods and seeds being formed. The latter were 

 apparently perfect, but no germination tests were 

 successful. The leaves were entirely devoid of 

 chlorophyl, but the leaflets were held in various posi- 

 tions with the upper surfaces concave, and did not 

 exhibit the nyctitropic movements, so far as my ob- 

 servations went, although particular attention was not 

 paid to this point. 



It is to be seen that the effects of " partial etiola- 

 tion " differ most widely from those in which the en- 

 tire plant is deprived of light. In partial etiolations 



Fig. 106. Etio- Fig. 107. Terminal portion of shoot. The branch A, has been enclosed in a 

 lated seedling ot small dark chamber and bears leaves, flowers and young pods formed under 



Phaseolus. 



these conditions. 



