CHAPTER XII. 



The Agricultural Chemistry of Cacao. 



HIS Chapter is kindly contributed by Prof. J. R 

 Harrison, M.A., Government Analyst, &c., <fec. f 

 of British Guiana. 



The main features of the chapter first) 

 appeared in an official report by the Professor 

 on the soils of Grenada to the Government of 

 that Island. 



The composition of the different parts of the cacao tree has 

 been treated upon by Marcano of Venezuela (a) and in part) 

 by Boname, late of Guadeloupe, now of Mauritius^). Opportu- 

 nities for studying the requirements of the plant as represented 

 by the composition of the mature trees themselves being very 

 limited we accept for guidance the result given by Marcano. 

 This authority estimates that a cacao tree twenty years old is 

 made up of 



Trunk ... ... ... ... 495 



Large branches ... ... ... 21*1 



Medium branches ... ... ... 11' 



Small Shoots ... ... ... 12- 



Leaves ... ... ... ... 6'4 



1000 



(a) Essais d'Agronomie Tropicale. V. Marcano. 



(b) La culture de la canne a sucre a la Guadeloupe. Ph. Boname 



