X1V OBITUARY NOTICES. 
Congregational Church in Milton, Mass. At the expiration of that 
period he left the ministry and devoted his whole time to geological 
pursuits. In 1872 he became Professor of Geology and Mining in 
the University of Pennsylvania, as well as the Dean of its Faculty 
of Science. In 1874 he was entrusted with the directorship of the 
second geological survey of this State. 
‘¢The hundred volumes and thousands of maps and sections of 
this survey will be his most enduring monument.”’ 
He threw great light upon the rock oil problem. He was one of 
the original members of the National Academy of Sciences; Presi- 
dent of the American Association for the Advancement of Science 
in 1884, and author of Man, His Origin and Destiny, from the Plat- 
form of the Sciences; Coal and Lis Topography, etc. 
“¢ Lesley’s character was wholly noble. He was generous to pro- 
digality towards others while careless of his own ease and comfort. 
Plain living and high thinking was the motto which moulded his 
life.’ 
Surrounded in his closing years by a loving wife and devoted 
daughters, he peacefully passed away on June 1, 1903, at Milton, 
Mass, 
Sir GEORGE GABRIEL STOKES was born August 13, 181g, at 
Skreen, County Sligo, of which parish his father was rector. He 
entered Pembroke College, Cambridge, in 1837, graduated in 1841, 
became Fellow of the College in the same year, and in 1849 was 
elected Lucasian Professor of Mathematics. 
Professor Tate writes, ‘‘To us, who were mere undergraduates 
when he was elected to the Lucasian Professorship, but who had 
with mysterious awe speculated on the relative merits of the man of 
European fame whom we expected to find competing for so high 
an honor, the election of a young and (to ws) an unknown candi- 
date was a very startling phenomenon, but we were still more 
startled a few months afterwards when the new Professor gave pub- 
lic notice that he considered it part of the duties of his office to 
assist any member of the University in difficulties he might encoun- 
ter in his mathematical subjects. Here was, we thought, a single 
knight fighting against the whole melee of the tournament, but we 
soon discovered our mistake, and felt that the undertaking was the 
effect of an earnest sense of duty on the conscience of a singularly 
modest but exceptionally able and learned man, and so it has 
