Variations in the Carbohydrate Content. 1 1 5 



E. Variations in the Carbohydrate Content of Leaves. 



1. Garden Nasturtium {Tropaoluiii iiiajns) (Brown and Morris). 



Tropceohun majtis possesses a leaf which forms much starch. 

 Brown and Morris analysed three sets of leaves of Tropceohun iiiajns 

 by their methods indicated in the last section. One set of leaves 

 was picked at 5 a.m. and quickly dried in the steam oven ; the 

 second set was picked at the same time and kept in sunshine for 

 12 hours with the petioles in water before drying; the third set 

 was picked at 5 p.m. after 12 hours insolation. The results of the 

 analysis are given in the following table. 



Table XXX. 



Yar'uUioii in Starch mid Sugiw Content 0/ Tropoeolum Leaves, 



August 23rd. 



The values are given in percentages of the dry weight. 



In a further experiment one set of leaves was picked and dried 



at once while another set was placed in water in the dark for 24 



hours after picking. The results of the carbohydrate analysis were 



as follows : — 



Table XXXI. 



Cnrboliydrnte Content of Leaves before and after 24 hours in the 



Dark. 



This is the number given by Brown and Morris. 



