Three generations of Princes experimented with European grapes at the famous Linnæan Botanic Garden, Flushing, Long Island. Wm. R. Prince[32] author of _A Treatise on the Vine_, devoted his life to promoting the culture of the grape in America. He tried all of the European sorts obtainable, "reared" as he tells us, "from plants imported _direct_ from the most celebrated collections in France, Germany, Italy, the Crimea, Madeira, etc.; and above two hundred varieties are the identical kinds which were cultivated at the Royal Garden of the Luxembourg at Paris, an establishment formed by royal patronage for the purpose of concentrating all the most valuable fruits of France, and testing their respective merits."[33] After nearly a half century of experimentation he gave up the culture of foreign grapes and largely devoted the last years of his life to growing and disseminating native varieties, exercising, probably, a greater influence on the culture of American grapes than any other of the many men who have helped improve the grapes of this country. Nicholas Longworth,[34] of Cincinnati, Ohio, experimented with the European grapes for thirty years. His experience is best told in his own words written in 1846: "I have tried the foreign grapes extensively for wine at great expense for many years, and have abandoned them as unfit for our climate. In the acclimation of plants I do not believe. The white, Sweetwater grape is not more hardy with me than it was thirty years since, and does not bear as well. I have tried them in all soils and with all exposures. "I obtained 5,000 plants from Madeira, 10,000 from France; and one-half of them, consisting of twenty varieties of the most celebrated wine grapes from the mountains of Jura, in the extreme northern[35] part of France, where the vine region ends; I also obtained them from the vicinity of Paris, Bordeaux, and from Germany. I went to the expense of trenching one hundred feet square on a side hill, placing a layer of stone and gravel at the bottom, with a drain to carry off the water, and to put in a compost of rich soil and sand three feet deep, and planted on it a great variety of foreign wine grapes. All failed; and not a single plant is left in my vineyards. I would advise the cultivation of native grapes alone, and the raising of new varieties from their seed."[36]