1909.] 



Vegetable Assimilation and Respiration. 



21 



several stages in the process records were made of its weight, apparent degree 

 of turgidity, and hnear dimensions. 



Tlie turgidity records are shown in fig. 2. They are rough diagrams indicating 

 the positions assumed by the leaf when its .stalk was placed (1) vertically, and 

 (2) horizontally. Four stages are shown (A, B, 0, D), beginning with Stage A, which 

 represents the condition of the leaf after floating on water under a bell-jar till fully 

 turgid. 



The linear measurements were made with a millimetre scale between crosses marked 



Fig. 1. Fig. 2. 



on the leaf with waterproof ink. Fig. 1 shows tlie disposition of the marks, and of the 

 lengths measured. 



In Table XV the records of weight and dimensions are given, for the stages indicated 

 by the letters in the first column, in the order in which they were made. Stage A was 

 twice returned to by floating the leaf on water. 



The cJianges in the weight and dimensions from stage to stage are given in Table XVI, 

 as percentages of their value at Stage A. 



Table XV. 



Lengths are given to nearest j mm. 



Turgidity 

 diagram. 



Dimensions in centimetres. 



Fresh weight 

 in grammes. 



a — 5. 



c — d. 



e-f. 



f-9- 



A 



8-00 



5 -45 



9-45 



7-70 



2 -56 



D 



7 -65 



5 -20 



8-90 



7-60 



1 -97 



A 



8-00 



5-45 



9-47 



7-70 



2-56 



B 



7-77 



5-30 



9-30 



7 -67 



2-26 



C 



7 -70 



5 -25 



9-20 



7 -65 



2-06 



A 



8-05 



1 



5 -45 



9-47 



7-72 



2 -67 



