434 PROCEEDINGS OF THE AMERICAN ACADEMY 



Professor Dolbear exhibited a number of new radi- 

 ometers. 



Professor Searle showed some photographs of the transit 

 of Mercury. 



Professor Gibbs communicated the following papers, by 

 title : — 



1. On the Law of Boyle and Mariotte. 



2. On a Compensated Air Thermometer. 



3. On a Differential Calorimeter. 



Professor Farlow communicated the following paper, "by 

 title : — 



Contributions to the INIarine Flora of the United States, 

 No. 3. 



