742 PROCEEDINGS OF THE AMERICAN ACADEMY. 



upon Professor Charles R. Cross, Chairman of the Rumford 

 Committee, to state the grounds on which the award was 

 made. 



Professor Cross gave a brief account of Professor Nichols' 

 researches, after which the President, in the name of the Acad- 

 emy, presented the medal to Professor Nichols, who made an 

 appropriate reply expressing his appreciation of the high honor 

 which had been conferred upon him. 



Professor Nichols then showed experiments demonstrating 

 the pressure of rays of light. 



Remarks were made on this subject by Professor Webster, 

 who concluded with the motion that a vote of thanks be given 

 to Professor Nichols for his admirable experimental demonstra- 

 tions. 



The following papers were presented by title : — 



" The Kathode-luminescence of Fluorite." By Harry W. 

 Morse. Presented by John Trowbridge. 



" On the Self and Mutual Inductance of Cylindrical Sole- 

 noids." By A. G. Webster. 



Contributions from the Gray Herbarium of Harvard Univer- 

 sity. New Series, — No. XXXIV. I. "New Species of Sene- 

 cis and Schoenocaulon from Mexico." By J. M. Greenman. 

 II. " New or otherwise noteworthy Spermatophytes, chiefly from 

 Mexico." By B. L. Robinson. III. "New Plants from Guata- 

 mala collected by C. C. Deam." By B. L. Robinson and H. H. 

 Bartlett. IV. " Diagnoses of New Spermatophytes from Mex- 

 ico." By M. L. Fernald. Presented by B. L. Robinson. 



Nine hundred and seventy-second Meeting. 



March 13, 1907. — Stated Meeting, 



The Academy met at its House. 



The President in the chair. 



There were present twenty-one Fellows. 



Letters were read from Henry S. Pritchett, Henry G. Denny, 

 David W. Cheever, and Jeremiah Smith, resigning Fellowsliip ; 

 from the Michigan Agricultural College, inviting the Academy 

 to be represented by delegates at its fiftieth anniversary, May 



