The Barbados Sugar Cane Experiments. 361 



greater or even less than those obtained without them. 



6. On soils, such as those at Dodds, deficient in 

 organic matters, the use of insoluble phosphates does 

 not appear advisable. 



7. In soils at all deficient in potash, theaddition of pot- 

 ash, in the form of sulphate of potash, to the manures gives 

 largely increased yields, and the use of potash in large 

 quantities does not injuriously affe6l the purity of the juice. 

 It is well known that during recent years the crops 

 of Barbados very greatly increased, and that this 

 increase was due mainly to increased yield of canes 

 in the field, and not to improvements in the manufa6lure 

 of sugar, to which latter the majority of Barbados 

 planters have certain rooted obje6tions. Now, as for 

 many years pra£lically all the manures used in Barbados 

 passed through my hands for analysis, having been sent 

 either dire6tly by the makers or by the Agricultural 

 Society, I am in a position to state that the increased 

 crops coincided with changes in the compositions 

 of the manures used. Ten years ago the manures 

 contained less nitrogen than do those used at present, a 

 considerable proportion of the nitrogen being in 

 the form of organic matters, high proportions of 

 "soluble phosphates" and but little or no potash; 

 whilst the manures used now contain their nitrogen 

 almost entirely as sulphate of ammonia, " soluble phos- 

 phates" in much lessened proportions, and considerable 

 quantities of potash ; these changes being consistent with 

 the dedu6lions drawn from the Dodds experiments and 

 thus strongly confirming them. At the same time I must 

 mention that since 1884 large and increasing quantities 

 of manures, known as early cane manures and containing 



