XXXIV BIOLOGICAL SOCIETY OF WASHINGTON. 



Mr. True announced that at the next meeting he would move 

 to reconsider the day of meeting of the Society. 



Mr. John A. Ryder made a communication upon THE PROB 

 ABLE ORIGIN AND HOMOLOGIES OF THE FLUKES OF CETACEANS 



AND SlRENIANS.* 



SATURDAY LECTURES, 1885. 



The fourth course of Saturday Lectures, under the auspices 

 of the Biological Society and the Anthropological Society, was 

 begun February 7, 1885. The lectures were delivered in the 

 lecture room of the National Museum, and the following pro 

 gramme was carried out : 



February 7 : Prof. JOHN FISKE. Results in England of the 

 Surrender of Cornwallis. 



February 14: Dr. GEORGE M. STERNBERG, U. S. A. Germs 

 and Germicides. 



February 28 : Hon. EUGENE SCHUYLER. The Machinery of 

 our Foreign Service. 



March 7: Mr. WILLIAM T. HORNADAY. Natural History 

 and People of Borneo. 



March 14: Mr. CHARLES D. WALCOTT. Searching for the 

 First Forms of Life. 



March 21 : President E. M. GALLAUDET. The Language of 

 Signs and the Combined Method of Instructing Deaf-Mutes. 



March 28 : President JAMES C. WELLING. Oldest History in 

 the Light of Newest Science. 



April 4: Mr. FREDERICK W. TRUE. Ornithorhynchus ; a 

 Mammal that Lays Eggs. 



April ii : Dr. A. L. GIHTON, U. S. N. Sanitary Ignorance 

 among High and Low. 



April 18: Mr. J. S. DILLER. A Trip to Mt. Shasta, Cali 

 fornia. 



April 25 : Dr. D. E. SALMON. Our Invisible Enemies, the 

 Plagues of Animal Life. 



May 2 : Prof. T. C. MENDENHALL. Weighing the Earth. 



Amer. Naturalist, vol. xix (May), pp. 515-519. (Abstract). 



