1, Uncover vines as early as they are'perfectly safe from any sudden check, or in this climate; about the first of May.

2. Force the growth as much as possible, by opening the house late and closing it early, and giving"but little air until the grapes begin to color. The degree of heat which the vine will bear in our bright climate, is generally under-rated.

3. Keep the shoots constantly stopped a joint or two above the fruit.

4. Prune as soon as possible after wood is ripe, so that the wounds may heal before winter. With attention to these few rules, a crop even of the Alexandria Muscat, (one of the grapes not easily raised in England without fire,) may be secured every year in this climate, in a cold house; and any heating apparatus is entirely unnecessary, unless you wish fruit before the middle of August.

Mr. Knight, in a paper read to the Horticultural Society, May, 1816, explains very fully the-forcing by closed houses, and sun heat. This article is well worth republishing, as it is especially applicable to this climate, where as your correspondent on the culture of the Victoria Regia observes, a much greater degree of heat can be kept up, than in England. I think it not impossible that grapes could be ripened in Ward's cases, in our summer weather. I have kept a house closed for some time, I think two or three weeks, without injury to fruit or vines, in mid-summer. H. 0.

Boston.

[As we recognise in the above, the pen of "one who knows," we take the occasion to add that our preference for a north and south line for a vinery, must be taken as applicable to the climate of this country generally - of which the middle states must be taken as the average. The climate of Boston, (and New-England generally,) is much cooler in summer than that of Philadelphia - and therefore, so much less identical with that of the country generally. En].