MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 3OI 



Etiolated leaves of " stemless " plants also were much poorer in pro- 

 teids than green organs of the same species, while etiolated leaves 

 borne on aerial stems were richer in protein than normal green 

 leaves. These resuhs were obtained from examinations of etiolated 

 and normal specimens of beans and wheat. 



The data obtained in my own analyses may be restated in the form 

 of the following tables : 



Water, Dry Material and Ash in Cohms of Arisaema. 



Water, Ash, and Dried Material in Leaves of Arisaema. 



It is thus to be seen that the proportion of water in corms formed 

 during etiolation is less than under normal conditions, and this de- 

 crease continues in the second etiolation, in which the percentage is 

 higher than that of resting corms dried in the air at ordinary tem- 

 peratures (p. 61). At the same time the proportion of dry material in- 

 creases, although the actual amount is less of course. The propor- 

 tion of ash in corms formed as a result of the first etiolation is less 

 than the normal, and undergoes an increase in the second season's 

 growth in darkness. In like manner the proportion of ash in the 

 dried material is less than the normal in corms resulting from the 

 first etiolation, but increases during the second etiolation to a per- 

 centage much greater than the normal in fresh corms and greater 

 even than in air-dried corms. These results point quite conclusively 

 to an accumulation of ash in the body of the plant during its succes- 

 sive seasons of development when confined in the dark room. 



The proportion of water in the leaves is greater than the normal 

 during the first etiolation and shows a further increase during the 



