In his treatise, Prince described about seventy varieties of native grapes and several of the native species. Prince's descriptions of these grapes are comprehensive and judging from the sorts described by him which we now have they are accurate. He grew seedlings from many of them. He showed a knowledge of the possibilities of hybridization of American species with _Vitis vinifera_. He solicited and obtained seeds and vines from all the settled portions of the Union. His grape correspondents in different parts of America and of the world must have numbered hundreds. Prince's enthusiasm and perseverance in grape culture attached to him votaries in all fruit regions and to him more than to any other man was due that friendly interchange of knowledge and sentiment regarding grapes which characterized the half century after the appearance of his book. Such co-operation as was manifested in grape-growing in the second and third quarters of the nineteenth century has never been known in the culture of any other species of plant in this country and to it is largely due the progress of viticulture in leaps and bounds dating from Prince's time. With the close of the year 1830, we may consider viticulture a firmly established industry in America with the native grapes as a basis. Rafinesque's estimate of the acreage at this time is given on a preceding page (47). It is worth while considering, very briefly, the types of grapes under cultivation at this stage of the industry, with some discussion of the origin of the leading varieties. The first grape to become generally distributed as a commercial variety, was, as has been remarked before, the Alexander, or Cape. It came into prominence, through the deception of Legaux and the credulity of Dufour, as one of the Viniferas commonly grown at the Cape of Good Hope. It proved, however, to be an offshoot of the fox grape of the woods, _Vitis labrusca_, and had been grown, long before Legaux palmed it off as the Cape, under the names Alexander and Tasker's, Alexander because of its having been grown by a gardener of this name and Tasker's through its cultivation on a somewhat extensive scale by a Mr. Tasker in Maryland. Its history dates back to the years before the Revolutionary War and its origin was probably on the banks of the Schuylkill in Pennsylvania, hence another of its many synonyms, Schuylkill Muscadell.