MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



303 



The following table by Karsten shows the actual amount of fresh 

 and dry material in a lot of plantlets produced by seeds weighing 

 1,000 grams, under normal conditions and in darkness : 



The superior weight of dry material in the internodes and hypo- 

 cotyl is the result of the greater age of the etiolated specimens, while 

 it is to be seen that the construction of dry matter in the roots has 

 fallen below that of plants with green stems and leaves (see p. 25). 



The following table by Karsten gives the number of parts of the 

 principal constituents of the dried material (at 105° C.) in 100 parts 

 of normal and etiolated plantlets and in seeds. The figures are given 

 to the nearest decimal of the first place and the data obtained from 

 normal plants is given in the column under A, and from etiolated plants 

 under B. 



The proportion of fats is seen to decrease in the leaves during 

 etiolation, to remain stationary in the hypocotyl, to decrease in the 

 stem, and increase in the roots. 



The proportion of sugar undergoes a marked decrease during eti- 

 olation throughout the entire plant, the greatest percentage remaining 



