A reference to page 444 of the Horticulturist for October last, will remind your readers that I had something to say about the grape. My remarks amounted to this - that I had raised in 1646, several seedlings, a cross between the Mlaeh Hamburgh and the Isabella, and that at tike time I wrote you, these had "borne the frosts of four winters." I sent you a bunch of the fruit, (it was not a good sample,) of which you remarked, "the bunch resembles that of the Isabella - -the grapes being hung somewhat loosely upon it. But the berries are round, blanker than the Isabella, and totally distinct in flavor from our native grapes - resembling the dark colored foreign grapes.1' Your notice, as far as it went, was nattering, and soon brought me numerous applications for "vines or cuttings," but I bad neither to dispose of at any price.

In the November number, page aid, Mr. Chorlton, of Staten Island, informed yon of the interest be felt in reading of my success, and remarked, that "too much praise cannot be given to that gentleman, (myself,) for his enterprising experiment, but it appears to mm that he has gone the wrong way to work." By which Mr. Chorlton meant to say,that I should have fertilized with the pollen of the Hamburgh, and not with that of the Isabella. The inference no one can mistake. My seedlings partaking so much more " the constitution and habit of the mother," are not as likely to prove vigorous and hardy as they would have been with the Isabella on the maternal side. "Physiological theory teaches" well, but " practical experience proves" her sometimes to be in the wrong. The question to be tested is - are the seedlings of my raising, and of which I gave you some account in September last, as hardy as the Isabella vine? Putting aside all physiological theory, I appeal to the past severe winter for an answer.

This test, in addition to the four previous seasons of cold, has tried my vines to my .entire satisfaction, and it has demonstrated that their constitution is " as hardy, If not more so, than the Isabella.*1 They need no eulogy from me beyond a declaration of the fact, that they have not received the least injury from their entire exposure to an unusual degree of frost. Mr. Chorlton may, by going the right way to work, far exceed my efforts in experimenting, and he may rest assured of my best wishes for his success, but until something better is an-nounced, I hold my seedlings to be superior to every other grape grown in the open sir in any part of the U. States. In all the essential qualities . of a first rate table grape, it is I venture to say Without a rival, and, notwithstanding the misfortune of having gone to work the "wroog - way,1' it will be yet some time before its equal will appear. This may be saying a great deal, and I may be thought partial to my new grape, but aa I am no speculator in humbugs, and don't particularly care to cater a la Barnum to the follies and cheats of the prevailing mania in almost everything, I can leave my grape to the ordeal of its own merits, and the test of time.

Nothing would have been easier than to have propagated a considerable stock for sale, but I have so far destroyed all the cuttings, and resisted very many exquisite hints, about giving or selling a single eye. If living and able to do so, I intend exhibiting the fruit in Boston this coming fall; then, its taste can be commented on, and a comparison instituted with the Diana and soma others that I have read of. I shall thus "give proof of its excellence," though not so sura of " startling the country with the intelligence of my having ten, twenty, or a bun-dred thousand plants" to sell. I aim at establishing the reputation of my grape on some bet ter evidence than the usual form of horticultural charlatanism. When I have done so, (if I ever do,) I shall then take into consideration the benefits I may justly claim as the result of my effort to improve a valuable and delicious fruit. Respectfully yours, Wx. W. Valk, M. D. Flushing, L. I., May 5,1862.

[FOR THE HORTICULTURIST].