ANNALS OF THE ACADEMY 85 



Professors C. R. Van Hise and E. H. Moore; and at the instal- 

 lation of Dr. Joseph Swain as president of Swarthmore College, 

 on November 15, 1902, the Academy's delegate was Professor 

 Edgar F. Smith. The centenary celebration of the birth of the 

 Norwegian mathematician Abel was held at Christiania on 

 September 5, 1902, on which occasion Professor Simon New- 

 comb was the delegate of the Academy. He was also delegated 

 to attend the meeting of the Council of the International Associa- 

 tion of Academies in London, June 4, 1903. 



The eighth volume of the Memoirs, containing seven articles, 

 was completed and published in 1902. 



I 903- I 907 



At the end of the third decade in its history, the number of 

 original members of the Academy who still remained was, as 

 already noted, but eight. At the end of the fourth decade, Janu- 

 ary I, 1904, all of these had died, save one. They comprised the 

 naturalist, James D. Dana, who was the first Vice-President of 

 the Academy (died in 1895) j Benjamin A. Gould, the astron- 

 omer (1896) ; James Hall, the paleontologist (1898) ; J. Peter 

 Lesley, the geologist (1903); H. A. Newton, the astronomer 

 (1896); J. D. Whitney, the geologist (1896); and Fairman 

 Rogers, who was the first Treasurer of the Academy, and served 

 in that capacity for sixteen years ( 1900) . 



The Henry Draper Medal was presented on April 20, 1904, to 

 Professor George E. Hale, Director of the Yerkes Observatory, 

 for his important services to astronomy. The report of the 

 committee, which made the award contains the following state- 

 ments regarding his labors: 



" The work of Professor Hale may be divided into four classes: Investigations 

 of solar phenomena, studies of stellar spectra, editing the Astrophysical Journal, 

 and the executive work involved in the direction of the Yerkes Observatory. 

 In 1868, it was shown by Janssen and Lockyer, independently, that solar 

 protuberances might be observed when the sun was not eclipsed. The method 

 employed was to allow an image of the edge of the sun's disk to fall upon the slit 

 of a spectroscope, and thus obtain the spectrum of this region only. If the image 



