OP ARTS AND SCIENCES. 301 



Dr. Harold Whiting presented the following contribution 

 from the Jefferson Physical Labratory. 



"Mr. Chittenden has constructed an air thermometer sftasitive to 

 the heat created by an alternating current passing through the human 

 body, and showing that such a current may be as great as one hun- 

 dredth of an ampere without causing excessive pain. By the same 

 instrument the effect of a strong telephone current may be detected. 



" The class in color have produced a triple composite photograph, 

 reproducing faithfully the colors of a considerable portion of an oil 

 painting. Specimen shown." 



Eight hnndred and twenty-fourth Meeting. 



June 12, 1889. — Adjourned Annual Meeting. 



The President in the chair. 



The Recording Secretary being absent Mr. Eliot C. Clarke 

 was appointed Recording Secretary pro tempore. 



The following papers were presented : — 



On a New Method of determining Gas Densities. By 

 Josiah P. Cooke. 



The Mecanique Celeste of Laplace, and its Translation with 

 a Commentary by Bowditch. By Joseph Lovering. 



Contributions to American Botany. Descriptions of New 

 Species of Plants and Notes upon various Points in Connec- 

 tion with our Northern Flora. By Sereno Watson. 



' Eight hundred and t>venty-fiftli Meeting. 



October 9, 1889. — Stated Meeting. 



In the absence of the President and Recording Secretary, 

 Dr. H. W. Williams was chosen President pro tempore, and 

 Mr. H. W. Haynes, Secretary. 



Voted, To adjourn to the second Wednesday in November. 



