Within the past two years Professor Egleston has withdrawn from active work in the School of Mines, and bears now the title of Professor Emeritus; his health has been a good deal impaired, and his work has passed largely into the charge of younger men who have grown up under his direction as students and assistants. During the last winter he has presented to the school his entire scientific library and his private collection of minerals above referred to, some six thousand specimens. These, in addition to the great mineralogical treasures already possessed by the institution, all gathered and arranged under his supervision, will make the School of Mines collection certainly one of the finest in the country. Although devoted to his own special branches, Professor Egleston had given a striking example of broad interest in other departments of science in his labor of love in connection with the monument to the memory of the great ornithologist Audubon. The present writer was closely associated with him in this work, and can testify to his energy, enthusiasm, and perseverance therein. The later years of Audubon's life had been spent on Manhattan Island, in a modest but beautiful suburban home on the Hudson, above Harlem, known as Audubon Park. He died in 1851, and was buried in a family vault in Trinity Cemetery, then far out of town, now lying between One hundred and Fifty-third and One Hundred and Fifty-fifth Streets, Amsterdam Avenue, and the Hudson. The spot was remote and almost unknown, and with the death and removal of most of the family, it had fallen into neglect. When One Hundred and Fifty-third Street was to be opened through to the river, the vault, which was close to the street line, was in danger of injury; and then Professor Egleston took up the matter and proposed to the trustees of the cemetery that if they would grant another plot in a better location, he would endeavor to have a handsome monument erected by national subscription. The trustees responded warmly, and Professor Egleston undertook the work. Before going abroad in 1887 he broached the subject to the writer, and suggested that he present it during the meeting of the American Association for the Advancement of Science, which was to be held during that summer in New York. The writer gladly responded to the plan, and in August of that year laid the facts before a general meeting of the association. Much interest was expressed, but no action was taken, as had been hoped. At the first regular meeting of the New York Academy of Sciences, in October, the writer again presented the subject, with better result; and a committee was appointed by the academy, consisting of Professor Egleston as chairman, Dr. N. L. Britton, and the writer. On the return of the former from Europe the work was taken up in earnest; and under the indefatigable efforts of the chairman and of the secretary, Dr. Britton, although with many