Men who Aided in Developing the Science of Geology. Ill 



among the foremost of the original discoverers of his day in geological 

 and palseontological matters. 



Edward Hartley was born in 1847, and died in Pictou, Nova Scotia. 

 November 10, 1870, at the age of 23 years. He was appointed an 

 assistant geologist upon the Geological Survey of Canada, in July, 

 1868, and mining engineer in 186^. His principal work was done in 

 connection with a survey of the Picton Coal basin. 



Sidney S. Lyon was born in Cincinnati, Ohio, Aug. 4, 1808, and died 

 at Louisville, Kentucky, on the 24th day of June, 1872. He was at one 

 time surveyor of the public lands of Texas, and afterward assistant 

 geologist on Owen's Geological Survey of Kentucky, where he dis- 

 tinguished himself as a palaeontologist. He subsequently became 

 eminent as an authority in the order Crinoidea. His papers appeared 

 in the American Journal of Science and Arts, in the Proceedings and 

 Transactions of the American Philosophical Society, and in the Pro- 

 ceedings of the Philadelphia Academy of Sciences. 



John B. Perry died on the 3d day of October, 1872, in his 47th 

 year. He was a Professor at Harvard College, and wrote several 

 valuable essays upon the Taconic Rocks in Northern Vermont. 



John W. Foster was born at Petersham, Massachusetts, March 4th. 

 1815, and died at Chicago, Illinois, on the 29th of June, 1873. In 

 1850 and 1851 he surveyed the Copper Lands of Lake Superior Land 

 District, in connection with Prof. J. D. Whitney. The two reports 

 and the atlas made his name familiar to all geologists. He was the 

 author of several ethnological papers. His last work, entitled " Pre- 

 Historic Races of the United States of America," appeared at about 

 the time of his death. 



Louis John Rudolph Agassiz was born Ma}' 28, 1807, at Mottier, 

 near Lake NeafohateL, Switzerland, and died December 14, 1873, in 

 Cambridge, Massachusetts. His works upon Natural History are 

 voluminous, and some of them are devoted to matters relating to 

 American Geology, and especially to vertebrate remains and surface 

 phenomena. 



William Logan was born in Montreal, April 23, 1798, and died at 

 Castle Malgwyn, Llechyrd, South Wales, June 22, 1875. He was at 

 the head of the Geological Survey of Canada, from 1842 to 1870. His 

 labors contributed vastly to our knowledge of Canadian geology. He 

 was careful in his investigations, and rarely theorized beyond the 



