OF ARTS AND SCIENCES. 623 



income of the General Fund, at a cost of $336.25, and 149 with 

 the appropriation from the income of the Rumford Fund, at a 

 cost of $23.92. 224 volumes were bound at an expense of 

 $331.95, of which $32.75 was charged to the Rumford Fund. 

 185 volumes were borrowed from the Library by 33 persons, of 

 whom 24 were Fellows of the Academy. 



The following reports were also presented : — 



Report of the Rumford Committee. 



At the last Annual Meeting of the Academy the sura of $1,000 

 was placed at the disposal of the Rumford Committee for use in aid 

 of investigations to which the Rumford Fund may properly be 

 applied. 



During the past year appropriations from this have been made as 

 follows : — 



(1) To Professor George E. Hale, Director of the Yerkes Obser- 

 vatory, $400, to meet in part the expense of the construction of a large 

 spectro-heliograph. 



(2) To Professor A. G. Webster, of Clark University, $250, for the 

 construction of an electrically governed revolving mirror. 



(3) To the same, $100, for an investigation upon the Zeeman effect. 



(4) To Professor A. A. Michelson, of the University of Chicago, 

 $250, to meet the cost of constructing a new form of interference spec- 

 trometer. To this appropriation an additional amount of $250, from the 

 Rumford Fund, was added by vote of the Academy at its March meeting, 

 on recommendation of the Committee. 



(5) In addition to these, at tlie request of the Committee, the Academy 

 at its January meeting voted to grant the sum of $400, from the 

 Rumford Fund, to Professor W. C. Sabine, of Harvard University, for a 

 research on ultra-violet radiations. 



In response to a request sent to these and other recent grantees, asking 

 for information as to the progress of the researches to which aid had been 

 rendered, replies have been received as follows : — 



Professor Hale writes : " I have at last succeeded in obtaining two 

 Yoigtliinder portrait lenses of 6j in. aperture, which are to serve as the 

 principal optical parts of the spectro-heliograph. These lenses, which 

 now cost $600 each, were purchased for $185 each. The bal- 

 ance of the $400 appropriation is to be used in paying an instru- 

 ment maker who will be employed iu constructing the spectro-heliograph. 



