2 Mr. Castles’s Obfervations, &c. 
will be more advantageous to the planter (when at the fame time 
progrefs is making in deftroying the fugar ants) than a full 
crop of any other produce. In feme very few fixations cot- 
ton perhaps may be excepted. As to coffee, it is to be con i- 
dered that it gives no return till the third year after planting, 
and not a full crop till the fifth. Cocao begins to bear in five 
years ; but yields little till the feventh : and indigo not only 
exceedingly impoverifhes the land, but is unhealthy to the 
negroes. Add to this, that far the greateft part of fugar lands 
are unfit for the culture of any of thefe. 
It would carry this Letter to too great a length were I to 
adduce all that may be faid on this fubjed ; I fhall therefore 
conclude by obferving, that the beft proof of the truth of the 
above dodrine will be the fuccefs attending the propofed me- 
thod of cultivation, or one of the fame tendency, vm. to 
attempt the deftrudion of the nefts of thefe infeds, and con- 
fequently the breeding ants, with their young broods; for 
their fecundity appears to be fo prodigioufly great as to render 
it altogether impoffible to deftroy them by poifon, which can 
never be generally enough ufed to effed that purpofe. 
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