I am gratified to learn that the Diana grape is of good quality south. The fruit in Boston is far inferior to the Catawba with us. I doubt not it will bo improved here. I have several vines that will fruit this season.

Tour correspondent errs in supposing a cutting from a grape-vine, perfect in male and female organs, can become barren. I would sooner believe in mesmerism than this. I have raised from cuttings, 300,000 bearing plants, and never a non-bearer. A cutting of a defective plant has got there by mistake. You certainly err in saying the Scuppernong of North Carolina is the only native grape that is not perfect in both male and female organs. In our woods, I believe the greater portion of our wild grapes will be found defective in female organs, and barren. I have had the wild seedlings, (the seed I presume dropped by birds,) generally of this character. You certainly err, also, in saying, that in England no attention has been paid to the sexes of the strawberry plant. The strawberries they usually cultivate, are hermaphrodite, and are chiefly used for forcing. In the open ground, with us, their large fruited ones will not average a quarter of a crop of perfect fruit. [Our correspondent has not seen the crops of British Queen grown in England, or he would not hold this opinion. En.] Where forced, the pistils arc better developed, and bear more fruit.

This is the character of their boasted variety, Keen's Seedling. But Mr. Keen himself, discovered that there were varieties wholly defective in the male organ. He says, in one of his letters to the London Horticultural Society, published in their Transactions, that he found one of his beds in forcing.

Mens, and removed a few plants to the frames, and every blossom was impregnated and bore a perfect fruit. I imported this variety near 80 years since, and still have it, and cultivate it largely. As soon as the character of the strawberry plant is settled east, the Early Scarlet will only be cultivated as an impregnator. I will present Mr. Hogg a silver cup of the value of $100. as soon as he will produce half a crop of fruit from Hovey's justly celebrated seedling, or the English Methven Scarlet, if separated from all others. Neither of them will bear a perfect berry.* The same is true of Burr's highly flavored New Pine. Mr. Hovry and Mr. Burr both know the character of their seedlings, and will endorse what I say. It is a mistake to say the Catawba is our only wine grape. I believe the wine from the Missouri and Herbemont, will command a higher price than the dry Catawba wine. I this season paid double price for some of the latter, to one of my tenants. I offered another a higher price, which he declined. The former, with skillful manufacture, will equal Madeira. The latter, the Spanish Manzanilla, which it resembles in aroma and flavor.

Tours resp'ly, N. Long-wotrh. Cincinnati, O., Feb. 20, 1851.