A correspondent ot the Watertown (N. Y.) Times gives the result of his expcrience io pruoing apple trees ; ' lt bas long been a practice among farmers to commence pruning applo trees in February, mainly, I suppose, because thero is leisure time. There are reasons wby this Bhould not be done. There will not bo sofficient action io the tree to harden the surface where a limb has been taken off before the sap ascends in the epriDg. When this acüon does take plfice, the sap flowa out and spreads over the Burrounding bark, and by some ehemical actiou whieh takes place, it is ohanged to a poisonous fluid, which greatly injures the tree. Trim your fruit trees in August, nnd I wil guaranice you will huve no blaek-hearted trees."