738 PROCEEDINGS OF THE AMERICAN ACADEMY. 



and $164.68 Rumford, Fund ; making a total of $1057.47 for the Gen- 

 eral, and $249.23 for the Rumford, Funds, as the cost of subscriptions 

 and binding. Of the appropriation of $50 from the Rumford Fund for 

 books, only one book has been purchased, at a cost of $7.50, although 

 more have been ordered, and will probably be received soon. 



A. Lawrence Rotch, Librarian. 

 May 12, 1909. 



Report of the Rumford Committee. 



During the year 1908-09 the Committee has made grants in aid of 

 researches in light and heat as follows : — 



June 10, 1908. Professor Norton A. Kent, of Boston Uni- 

 versity, for the purchase of a set of echelon plates or other 

 similar apparatus for his research on conditions influencing 

 electric spark lines $400 



Professor Joel Stebbins, of the University of Illinois, an addi- 

 tion to a former appropriation for his research on the use of 

 selenium in stellar photometry 100 



Jan. 13, 1909. Professor W. W. Campbell, of the Lick 

 Observatory, for the purchase of a Hartmann photometer to be 

 used in the measurement of polarigraphic images of the solar 

 corona 250 



Feb. 10, 1909. Professor R. W. Wood, of the Johns Hopkins 

 University, for his research on the optical properties of mercury 

 vapor 150 



May 12, 1909. Professor M. A. Rosanoff, of Clark l/niversity, 

 for his research on the fractional distillation of binary mixtures. 300 



Professor C. E. Mendenhall, of Wisconsin University, for his 

 research on the free expansion of gases 300 



Reports regarding the progress of their respective investigations 

 have been received from Messrs. P. W. Bridgman, E. B. Frost, L. J. 

 Henderson, L. R. Ingersoll, N. A. Kent, F. E. Kester, A. B. Lamb, 

 H. W. Morse, E. F. Nichols, A. A. Noyes, J. A. Parkhurst, T. W. 

 Richards, F. A. Saunders, J. Stebbins, J. Trowbridge, and R. W. Wood. 



Since the last annual meeting the following papers have been pub- 

 lished in the Proceedings, at the expense of the Rumford Fund : — 



"A New Method for the Determination of the Specific Heat of 

 Liquids." T. W. Richards and A. W. Rowe. June, 1908. 



" Concerning the Use of Electrical Heating in Fractional Distillation." 

 T. W. Richards and J. H. Mathews. June, 1908. 



"Crystal Rectifiers for Electric Currents and Electric Oscillations." 

 G. W. Pierce. March, 1909. 



