sxvi Trans. Acad. Sci. of St. Louis. 



of hydrocarbons, from which it appeared that when T is the 

 boiling temperature (absolute scale), p is radius of gyration 

 of the molecule, and a is a constant, then T^ = ap. This 

 holds for the entire series of saturated hydrocarbons, includ- 

 ing all isomers. The speaker stated that his observations had 

 not yet been extended beyond the series indicated. 



Messrs. Green, Nipher, and Hunicke were elected a com- 

 mittee for the nomination of officers for the year 1900. 



December 18, 1899. 



President Engler in the chair, twenty-seven persons present. 



The Council reported the resignation of John T. Alden, and 

 the death, not yet recorded, of Mr. A. W. Straub. 



The nominating committee reported the following list of 

 candidates for 1900 : — 



President Edmund A. Engler. 



First Vice-President 1). S. H. Smith. 



Second Vice-President M. H. Post. 



Recording Secretary YiTilliam Trelease. 



Corresponding Secretary Joseph Grindon. 



Treasurer Enno Sander. 



Librarian G. Hambach. 



Curators G. Hambach, 



Julius Hurler, 

 Hermann von Schrenk. 



Directors Amand Ravold, 



Henry W. Eliot. 



Dr. Amand Ravold addressed the Academy on the necessity 

 and means of filtering and otherwise purifying water, especi- 

 ally with reference to freeing it from bacteria for municipal 

 purposes. The speaker explained the sand-bed filter system 

 as used in Germany and England, and the American mechan- 

 ical system, represented by two commercial devices. The 

 Wormser filter plate was also described and its characteristics 

 were considered. 



One person was proposed for active membership. 



