In the December number of the Horticulturist, one of your correspondents and yourself, unite in denouncing the Sage Grape as a " humbug." It is true, there are a great many humbugs in horticulture. There is one large class, too formidable to be killed by mere exposure, but which taxes oppressively all the energies and vigilance of the cultivator to avert their ravages, even when he has discovered their mode and point of attack. The other, (which may be called the moral class,) is not quite so numerous, but will fly quite as fast - sometimes hard to detect, but when once discovered, just holding them up to the light destroys them in a trice. Neither class escapes your notice - and it should be so, for in some cases it is hard to tell which are the most mischievous and aggravating.

The public have so often been bitten by this im-moral class of humbugs, that they are afraid of anything which has been dubbed humbug, (which, by the way, are a progeny of the big-bugs,) and shun it without examination.

But t must object to your calling the Sage Grape by this unenviable cognomen in so much of a hurry. I have seen the grape from the original vine; have frequently eaten of them raised here; numerous friends and neighbors have tasted them; specimens have been sent to the conductors of the most respectable Journals of Agriculture, and to pomological writers, in our state. All, without exception, have pronounced them "good, excellent, sweet, possessing valuable qualities," etc, etc. Besides all this, the grape in question is black as the Isabella, instead of being light colored. A commendatory notice of the press first brought the grape into notice here.

A knowledge of these facts induces me to think that the "light colored variety" sent you, was either not the Sage Grape, or Unripe specimens. Possibly the editor and his amateur correspondent, have been " sat upon" by some horticultural friends, and had Black Hamburghs administered to them till they have lost all consciousness of the fitness or worth of any native grape for the table.

When the Horticulturist containing the Sage Grape humbug was issued, a friend of mine happened to he in a town some fifty miles distant, where vines of this grape are in successful cultivation, and was suddenly accosted with, " well the Sage Grape is blowed up - it is all an exploded humbug." On being asked on whose authority, was told by the editor and correspondent of the last Horticulturist - and immediately added, " I don't care for that - my vine has fruited, and the fruit was good - I am satisfied." This man, like your correspondent, was induced to procure a vine by the description in Allen's work. It seems in inducements they agree, in tastes they differ.

I earnestly insist upon these facts being placed before your readers in the pages of the Horticulturist, that the testimony on both sides may be "in" before the honest reputation of the Sage Grape, (which has been steadily extending for five years,) be summarily consigned to disgrace.

I very well know the Editor's almost world-wide renown for a just and discriminating taste in every thing connected with horticulture and rural architecture. But I have heard it deferentially intimated, that when he penned the article on the Sage Grape, his literary taste was not quite so exquisite.

Please accept these remarks from a lover of the Horticulturist, and A SUBSCRIBER FROM THE BEGINNING. Groton, Jan. 5,1838.

P. S. If you desire, or will venture another examination, I should like to send you specimens from here next autumn. [Should be very glad to receive them].