84 RUBBER AND 



Thus the averages of all the concentrations determined 

 during this experiment, from 1908 to 1911, were as 

 follows : 



TABLE XXII 

 Percentages of rubber in latex. 



The seasonal variation in the concentration of the 

 latex during prolonged tapping are similar to those 

 observed in the total yield of dry rubber. The pe'r- 

 centage of rubber was found to be generally highest 

 about January and lowest about June. This fact 

 supports the view that the yield depends upon nutrition 



TABLE XXIII 

 Percentages of rubber. Monthly averages^ 1909 1911. 



