268 



SMITH 



In Theobroma Cacao the section of a young dark red leaf 

 was 120 ^ thick, while a mature green leaf was 174 jj, thick 

 and had a thicker cuticle. 



Table XXXI. gives the results of a comparison of the young 

 leaf of Saraca indica with the mature leaf. In this case the 

 young leaf is thin, flaccid, and almost white, while the mature 

 is thick and green. 



Unfortunately the breeze became so constant that further 

 readings in still air could not be obtained. The readings 

 obtained show that the mature leaf was decidedly higher in 

 temperature, to the extent of about 4° C., than the young leaf. 

 This, of course, considering the difference in pigmentation, 

 was to be expected. 



Table XXXII. gives the results of a similar comparison for 

 the leaves of Theobroma Cacao. The young leaf contains a 

 large quantity of anthocyan. The mature leaf is green. 



For the young leaf another younger one was substituted, which 

 differed in being rather more densely pigmented with anthocyan, 



