The Academy of Natural Sciences 37 



story to the building in 1855, when part of the library was moved 

 into it, and the weekly meetings were held there until the removal 

 to South Logan Square. 



In 1876, By-Laws were adopted providing for the appoint- 

 ment of thirteen professors, each with authority to appoint one 

 or more assistants. 'A number of these positions were filled and 

 acceptable courses of lectures were delivered by J. Gibbons Hunt 

 on histology and microscopic technology; by Henry Carvill Lewis, 

 on mineralogy; by Angelo Heilprin, on invertebrate paleontology 

 and geology; by Benjamin Sharp, on lower invertebrata, and by 

 Daniel G. Brinton, on ethnology and archeology. These courses 

 were well attended, and were, under the energetic management of 

 the Rev. Dr. McCook as chairman of the Committee on Instruction 

 and Lectures, productive of excellent results, but none of them 

 secured sufficient return for the adequate compensation of the 

 professors, and, in the absence of endowments, the By-Laws 

 defining the positions were subsequently repealed. 



Courses of popular evening lectures were delivered successfully 

 during the winters of 1887 to 1895. In 1896 a proposition was 

 made by the Ludwick Institute that the Committee on Instruction 

 should cooperate with the Institute in arranging a course of lectures 

 on natural science and allied subjects, to be given in the Academy's 

 lecture hall and to be free to the public though primarily for the 

 benefit of public school teachers, the Ludwick Institute bearing all 

 expenses. Under this arrangement six to eight courses have been 

 given annually by members of the society, the courses for the 

 session of 1908-1909 being as follows : Seneca Egbert, A.M., M.D., 

 "The Prevention of Disease and the Preservation of Health;" J. 

 Percy Moore, Ph.D., "Illustrations of the Life Histories and Habits 

 of the Lower Animals;" Spencer Trotter, M.D., "Anthropology and 

 Ethnology;" Henry A. Pilsbry, Sc.D., "Shell Fish (Mollusks) ;" 

 Witmer Stone, A.M., "Studies in Local Bird Life ;" T. M. Lightfoot, 

 M.S., Ph.D., "Economic Geology;" Stewardson Brown, "Wild 

 Flowers and Seasons;" Henry Skinner, M.D., "Geographical Dis- 

 tribution of Insects/' 



The following officers were elected at the annual meeting to 

 serve during 1909 : 



President, Samuel G. Dixon, M.D., LL.D.; Vice-Presidents, 

 Arthur Erwin Brown, Sc.D. and Edwin G. Conklin, Ph.D.; 

 Recording Secretary and Librarian, Edward J. Nolan, M.D. ; Cor- 



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