On the Internal Temperature of Leaves in Tropical 

 Insolation, with Special Reference to the Effect 

 of their Colour on the Temperature ; also 

 Observations on the Periodicity of the Appear- 

 ance of Young Coloured Leaves of Trees 

 growing in Peradeniya Gardens. 



BY 



A. M. SMITH, 



Demonstrator in Botany, Cambridge University. 



CONTENTS. 



Part I. 

 Introduction. 

 Description of Apparatus. 



Preliminary Tests of the Accuracy and Sensitiveness of the 

 Method. 



Results — 



High Temperatures reached by Illuminated Leaves. 



Effect of the Thickness of the Leaf. 



Estimation of Effect of Transpiration on Temperature. 



Effect of Air Movement. 



Effect of Colour— 



(a) Historical. 

 (6) Experimental. 



Part II. 

 On the Periodicity of new Growth in certain Evergreen Trees. 

 Observations., 



Closer Analysis of the Phenomenon of Periodic Growth. 

 Conclusions and Theoretical Suggestions from the Observations. 

 Summary. 

 List of Literature. 



[Annals of the Royal Botanic Gardens, Peradeniya, Vol. IV., Part V., March, 1909.] 



