Mrs. Pinch's Black Muscat Grape has been the subject of anxious inquiry among grape-growers, and the result is that the whole of its history is now before the public. That it should excite curiosity somewhat beyond the average of similar subjects, may be attributed to two circumstances - first, the reports of its peculiar excellence as a table grape and its long-keeping properties; and secondly, the somewhat out-of-the-way locale of the parent vine, which has prevented many of the best judges of grapes from seeing it. However, it has been seen by many of the best grape-growers in the country, and in these pages their testimony has been given in favor of its general adoption where a long-keeping grape of the finest quality is in any respect a desideratum.

The history of this grape is interesting. The late Mrs. Pince - who, like her much-respected husband, Mr. R. T. Pince, of the Exeter Nurseries, was an enthusiast in horticulture, and well versed in many of its mysteries - was one day eating a bunch of grapes, and observed that one of the berries contained a peculiarly large, round stone. She desired it might be sown. This was done, the vine grew, and in the year 1862 first produced fruit. Mrs. Pince was not then living to witness the evidence of her good judgment and perception in regard to the sowing of the selected seed; but the seedling plant was observed to possess some peculiar properties, and it was named, in remembrance of her, "Mrs. Pince's Muscat," and has now become such a memorial of her virtues as those who hold her name in affectionate remembrance can best desire. On several occasions this variety has come before us for critical examination, and we have had in every case to report in its favor. Yet, in truth, it is but lately that the whole character of the variety has been manifested; its immense fruitfulness and its good keeping could be ascertained only by the test of time, so that, from promising at first to be an admirable grape, it has proved at last to be one of the very best at the command of the cultivator.

In the "Garden Oracle" of 1864 we reported on it as " the best grape of the year," having become acquainted with it in the autumn of 1863. In the Gardener's Magazine we have several times directed attention to it, and have made public our impressions, derived from seeing the original vine at home, surrounded by abundance of its progeny, the parent commencing its new growth while fruit of the previous year still remained upon the rods. In growth this variety is peculiar. The young wood is of a purplish hue; the leaves are small, nearly triangular, deeply and elegantly lobed, and of a bluish tinge of green. The bunches are large, long, tapering, well shouldered; the berries oval, as large as those of the Muscat of Alexandria, purplish black with a thin bloom. They are borne on short, rigid, green stalks, with thick warted receptacles, a character which in some part accounts for the length of time the bunches will keep good if left hanging on the vine. The skin is tough, but scarcely thick; and this, again, is in favor of late keeping, for no tender-skinned grape can be kept long after ripening.

The flesh is firm, sweet, exceedingly rich, and of a decided Muscat flavor, changing, however, to a Frontignan flavor after the bunches have been long kept.

One of the special advantages resulting from the distribution of this variety is, that in places where there is much demand for grapes in spring, it will lessen the labors and anxieties of the cultivator, and in some cases render early forcing unnecessary. It is in its prime from the end of January to the end of April; keeping improves it, and the second-class varieties in cultivation, which are valued chiefly for their keeping, will have to yield up their places to it, for it will assuredly supersede them. Mr. Meredith, of Garston, who knows as well as most people the commercial value of a first-class spring grape, to be obtained in abundance without forcing, has lately built a house expressly for this variety, and in almost every good garden in the country young canes will be planted during the present autumn.

Now that Mrs. Pince's Muscat is in course of distribution, we must cease to regard it as in course of probation. Its character is established, its fame secured, and we confess a feeling of peculiar satisfaction in having been enabled to assist in giving publicity to the merits of so valuable an acquisition. - Gardener's Magazine.