text: ) In the following passage he notices a curious but generally received fact regarding the effect of different quantities of bones; but we quote chiefly on account of another observation at its close which may be interesting to our southern readers:-- "I have tried to raise turnips with different quantities of bone-dust varying from twelve sixteen twenty and twenty-four bushels to the imperial acre and have found the crop improved up to sixteen bushels; but any quantity beyond that even to twenty-four bushels produced no greater effect on the turnips in the same field and on the same sort of soil than sixteen bushels