12 



TBINIDAD AND TOBAGO BULLETIN. [XVIII. 1. 



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Fig. II. 



"When examined the canes at the south-eastern corner A (treated) 

 were distinctly better than those at the south-western corner B 

 (untreated) and it was claimed that this was due to the application of 

 the liquid. The change however was gradual and not distinct at the 

 edge of the treatment. In addition the same difference was found 

 along the northern edge of the field where there had been no difference 

 in treatment ; the canes at the north-eastern corner D were very much 

 better than at the north-western corner C. In fact the eastern end of 

 the field, treated or untreated, was distinctly better than the western 

 end. 



Further, on reference to my notes of last year, I find recorded on 

 November 16, 1917, that a block of damaged fields just to the north of 

 Field 100 (which was then in plant canes) were distinctly better at the 

 eastern end than at the western end, without any difference of 

 treatment. 



There is therefore little doubt that the superiority of the treated canes 

 at A over those at B (which were untreated) is in part at least explain- 

 able by differences, probably in soil conditions, without any effect on 

 the part of the liquid. 



One or two other fields were visited at Orange Grove but in no other 

 -case had any part of the fields been left untreated for comparison. 

 Without this no reliable results can be obtained. 



Throughout the estate, on fields treated or untreated there were very 

 few froghoppers. 



Caroni. 



A small block of canes at Caroni, field 77 had been treated on 

 October 26. The canes were 1st ratoons of D 109. 



Mr. Glasgow brought 60 gallons of his mixture. This was said to be 

 sufficient for half an acre, but " owing to there being no other land 

 prepared " (the preparation consisted of the removal of the trash from 



