Soon after the Massachusetts Horticultural Society was formed, Mr. Wilder was associated with the late Gen. Henry A. S. Dearborn, its first president, and from that time till now has been one of its most efficient members, having two years since delivered the oration on the occasion of its fiftieth anniversary. One of the most important acts of this society was the purchase of Mount Auburn for a cemetery and an ornamental garden. On the separation of the cemetery from the society, in 1835, through Mr. Wilder's influence, committees were appointed by the two corporations, Judge Story being chairman of the cemetery committee, and Mr. Wilder of the society committee. The situation was fraught with great difficulties; but Mr. Wilder's conservative course, everywhere acknowledged, overcame them all, and enabled the society to erect an elegant hall in School street, and afterwards the splendid building it now occupies in Tremont street, the most magnificent horticultural hall in the world. In 1840 he was chosen president, and held the office for eight successive years. During his presidency the hall in School street was erected, and two triennial festivals were held in Faneuil Hall, which are particularly worthy of notice. The first was opened September 11, 1845, and the second on the fiftieth anniversary of his birth, September 22, 1848, when he retired from the office of president, and the society voted him a silver pitcher valued at one hundred and fifty dollars, and caused his portrait to be placed in its hall. As president of this association he headed a circular for a convention of fruit-growers, which was held in New York, October 10, 1848, when the American Pomological Society was formed. He was chosen its first president, and he still holds that office, being in his thirty-third year of service. Its biennial meetings have been held in New York, Philadelphia, Cincinnati, Boston, Rochester, St. Louis, Richmond, Chicago, and Baltimore. On these occasions President Wilder has made appropriate addresses. The last meeting was held September, 1881, at Boston, where he presided with his usual vigor and propriety, at the advanced age of eighty-three.