10 IOWA ACADEMY OF SCIENCE 



Proceedings of the Thirtieth Annual Session, Held 

 in Des Moines, April 28 and 29, 1916. 



The Academy held its meetings in Memorial Hall, Drake Uni- 

 versity, corner University Avenue and 26th Street, Des Moines. 

 The first session convened at 1 :30 p. m., Friday, April 28th, with 

 President Kelly in the chair. Following the general program the 

 Academy divided into sections for the reading of papers. 



Doctor Louis Kahlenberg, of the University of Wisconsin, gave 

 the annual address, at 8 :00 p. m., Friday, in the University Audi- 

 torium. His subject was "Some Results from the Experimental 

 Study of Osmosis." 



The Iowa Section and the Ames Section of the American 

 Chemical Society held their sessions at 9 :00 a. m., Saturday. 



Members of the Mathematical Association of America met at 

 4 :30 p. m., Friday, to organize an Iowa Section. 



REPORT OF THE SECRETARY. 



Fellows and Associates of the Iowa Academy of Science: 



A study of the lists of the Academy membership during re- 

 cent years shows that while there has been no marked increase in 

 numbers the Academy has held its own, and that in spite of the 

 numerous removals which occur every year. The Treasurer and 

 the Secretary have carried on a follow-up campaign among those 

 who have been tardy in keeping up their membership. A num- 

 ber of members have sent in during the year names proposed for 

 membership. This is a welcome sign of activity and is a prac- 

 tice which should be followed still more energetically. It is not 

 enough to maintain our membership at the same level. "We 

 should endeavor to raise it each year by continual work among 

 those who are interested in scientific studies. 



The recent volume of the Proceedings is the largest yet is- 

 sued, and certainly has not been excelled in the quality of its 

 contents. The action of the last Legislature in removing the 



