466 RECORDS 



negative temperature coefficients. Tlie films are deposited from 

 a kathode of the same material by the discharge of electricity 

 through a v^acuum, and can be deposited in any thickness de- 

 sired, and of any metal, gold and platinum being however the 

 most convenient. The speaker showed a gold film of varying 

 thickness in different parts, the thickest part showing the green 

 color like gold leaf when viewed by transmitted light, and the 

 color varying through blue to violet as the film became thinner. 



In the third paper the speaker stated that at the suggestion 

 of Mr. C. C. Trowbridge, he had attempted to deposit a thin 

 conducting film of selenium, but he was unsuccessful as the 

 film deposited was non-conducting. He obtained, however, a 

 film of varying thickness which exhibited the phenomenon of 

 Newton's rings in a beautiful manner. 



The section then proceeded to the election of sectional of- 

 ficers. The motion was made and passed to take an " informal" 

 ballot. The informal ballot was taken. For Chairman, Pro- 

 fessor Pupin received three votes, and Professor Hallock six 

 votes. For Secretary, Dr. Day received nine votes. The mo- 

 tion was then made and passed that this ballot be regarded as 

 the formal ballot. Professor Hallock was therefore declared 

 elected Chairman and Dr. Day, Secretary. 



The section then adjourned. 



Wm. S. Day, 



Secretary. 



SECTION OF BIOLOGY. 



March 12, 1900. 



Section met at 8:15 P. M., Professor F. S. Lee presiding. 



The minutes of the last meeting of Section were read and ap- 

 proved. 



The name of one candidate for resident membership was 

 read and referred to the Council according to the By-Laws. 



The following program was then offered : 



E. L. Thorndike, Mental Life of Animals. 



D. T. Macdougal, Symbiosis of Roots and Fungi. 



