Albert Benjamin Prescott, '64_m_, who eventually succeeded Dr. Silas H. Douglas as Director of the Chemical Laboratory, became Assistant Professor of Chemistry in 1865. He organized the course in Pharmacy three years later, becoming Professor of Organic and Applied Chemistry and of Pharmacy in 1870. In 1876 he became Dean of the new College of Pharmacy and in 1884 Director of the Chemical Laboratory. Upon his death in 1905 he was succeeded as Director of the Chemical Laboratory by Edward DeMille Campbell, '86, who had been Professor of Chemical Engineering and Analytical Chemistry since 1902. After the retirement of Professor Williams in 1877, Charles K. Wead, Vermont, '71, became Acting Professor of Physics, to be succeeded in 1885 by Henry Smith Carhart, Wesleyan, '69, who held the chair of Physics and the Directorship of the Physical Laboratory until his retirement in 1905. His successor was John Oren Reed, '85, who became also Dean of the Literary Department in 1907. Upon Dean Reed's death in 1916 the Professorship of Physics passed to Harrison McAllister Randall, '93, who became Director of the Physical Laboratory in 1918. [Illustration: THE UNIVERSITY OBSERVATORY The original building at the right] [Illustration: HILL AUDITORIUM] [Illustration: THE CHEMISTRY BUILDING] [Illustration: THE NATURAL SCIENCE BUILDING] At the end of Professor Winchell's first period in the University in '73, the several subjects which comprised his professorship were divided. The chair of Botany passed to Eugene Woldemar Hilgard, Ph.D., Heidelberg, '53, who was succeeded two years later by Volney Morgan Spalding, '73, as Instructor in Botany and Zooelogy, becoming Professor of Botany in 1886. Upon his resignation in 1904 the chair was occupied by Frederick Charles Newcombe, '90. The work in Zooelogy passed to Joseph Beal Steere, '68, who became an Assistant Professor in 1876, after five years of travel in the interests of the University in South America, China, and the East Indies, where he collected some 20,000 specimens for the Museum. He became Professor of Zooelogy in 1879, and retained the chair until 1894, when he was succeeded by Jacob E. Reighard, '82. William Henry Pettee, Harvard, '61, assumed the work in mineralogy in 1875 under the title of Professor of Mining Engineering. In addition to his work in his own subject, he served from 1881 to 1904 as editor of the University Calendar and advisory editor of other University publications. Edward Henry Kraus, Syracuse, '96, who occupies the chair of Mineralogy at present, first came to the University in 1904 and succeeded to the chair in 1908. When Professor Winchell returned to the University after his term as Chancellor of the University of Syracuse, he became Professor of Geology and held that position until his death in 1891, when he was succeeded by Israel Cook Russell, New York University, '69. Upon Professor Russell's death in 1906, William Herbert Hobbs,