COCOA-GROWING COUNTRIES 357 



improving shade trees, with the soils in other countries, 

 where those soil -improvers seem almost to be indis- 

 pensable. 



One analysis may be given here : 



Organic matters and combined water 



Phosphoric anhydride 



Sulphuric anhydride 



Chlorine . 



Iron peroxide . 



Aluminium . 



Manganese oxide . 



Calcium oxide . 



Calcium carbonate . . 



Magnesium oxide . 



Potassium oxide . 



Sodium oxide . 



Insoluble silica and silicates 



Containing nitrogen 



9-688 



0-058 



0-027 



traces 



12-033 



12-710 



0-249 



1-183 



0-099 



0-680 



0-428 



1-102 



61-743 



100-000 



0-224 



As to the climate of Grenada, the following figures 

 are average-figures of the rainfall during five years at 

 two stations : 



RAINFALL IN MILLIMETRES 



The dry season lasts from February to April, whilst 

 the months of July and August are the wettest. 



Averages of 2040 and 1830 mm. may certainly 

 not be considered as indicating a very heavy rainfall, 

 and there is therefore no reason to consider the heavy 

 rainfall as the circumstance which makes cocoa-growing 

 without shade possible in Grenada. 



.The actual circumstances are : (l) a soil of fine 

 quality, (2) conditions which make the keeping of a 



