1 Trans. Acad. Sci. of St. Louis. 



the several objects, an interesting half hour was spent 

 in the inspection of this exhibit, which included the man- 

 uscript and original sketches for Engelmann's thesis as 

 well as the publication itself in a copy with partly colored 

 plates ; several volumes of his many thousands of unpub- 

 lished notes and sketches; the simple dissecting micros- 

 cope and the elaborate compound microscope made by 

 Hachet; the Jubilee Medal struck by the Academy in 

 1906, bearing Engelmann's portrait; an illustration of 

 the Colorado Engelmannia spruce; and specimens and 

 original descriptions of the three genera of plants that 

 have been dedicated to his memory in the name of Engel- 

 mannia. 



The following were elected to membership: J. W. 

 Blankinship, Ben Blewett, C. H. Danforth, Victor E. Em- 

 mel, Henry V. Farr, Eobert H. Fuhrmann, W. W. Ohl- 

 weiler, George M. Reed, Robert S. Schlueter, Charles H. 

 Thomi^son, Meyer Wiener. 



February 15, 1909. 



President Trelease in the chair; attendance 75. 



The following program had been arranged, to com- 

 memorate the centenary of the birth of Charles Darwin 

 (February 12, 1809.): 



Darwin as a Naturalist Professor S. M. Coulter 



Darwin's Influence Upon Geology 



Professor W. E. McCourt 



The Natural Selection Theory and Its Latter 



Day Critics Professor J. F. Abbott 



Some Aspects of Darwin's Influence Upon Mod- 

 ern Thought Professor A. 0. Lovejoy 



At the conclusion of the special meeting. Professor 

 Niplier presented to the Academy some changes in the 

 manner of his experiments, and some of the additional 

 results that he has obtained in his studies of momentum 

 effects in electric discharges. 



The following were elected to membership: George 

 L. Allen, F. W. Brockman, Murray Carleton, Peyton T. 

 Carr, Daniel Catlin, Harley P. Chandler, Enos Clarke, 



