Men who Aided in Developing the Science of Geology. . 109 



Benjamin Silliman was bom in North Stratford, Connecticut, August 

 8, 1779, and died in New Haven, November 24, 1864, at the age of 85 

 years. He established the American Journal of Science and Arts, and 

 maintained it daring his life. His work on geology and kindred 

 sciences will be found in that journal. 



Abraham Gesner was born at Cornwallis, Nova Scotia, in 1797, and 

 died at Halifax, April 29, 1864. He was a physician, chemist and 

 author of several works on the Geology of Nova Scotia and New 

 Brunswick. 



Edward Hitchcock was born at Deerfield, Massachusetts, May 24, 

 1793. and died at Amherst, February 27, 1864. His life was devoted 

 to educational matters, and especially to the science of geology. His 

 first geological paper, entitled "Remarks on the Geology and Miner- 

 alogy of a section of Massachusetts on Connecticut River." appeared 

 in the first volume of the American Journal of Science and Arts, and 

 was dated at Deerfield, October, 1817 ; and his last article, entitled, 

 "New Facts and Conclusions respecting the Fossil Foot-marks of the 

 Connecticut Valley,'' was published in the eighty-seventh volume of 

 the same journal, in July, 1863. It was at his suggestion that the 

 State of Massachusetts added a geological surveyor to the corps charged 

 with the preparation of a trigonometrical survey of the State in 1830. 

 He was State geologist of that State for many years, and his reports 

 are both voluminous and valuable. His reports on the Geology of 

 Vermont contain a large part of what we know of the geology of that 

 State. But the great work of his life was the study and determina- 

 tion of the "Fossil Foot-marks of the Connecticut Valley, or the Ich- 

 nology of ]Sew England.' 1 



John L. Riddell was born in Leyden, Massachusetts, February 20. 

 1807, and died in New Orleans, October 7, 1865. His writings relate, 

 chiefly, to chemistry, botany and medicine, though he was active in 

 procuring the first geological survey of Ohio, and wrote a preliminary 

 report. 



Henry Darwin Rogers was born in Philadelphia, in 1809, and died 

 at Glasgow, in Scotland, on the 29th day of Ma}% 1866. He was State 

 geologist of New Jerse}' in 1835, and in 1836 became State geologist 

 of Pennsylvania. The survey of the latter State was prosecuted for 

 six years, and then suspended for want of the necessary appropria- 

 tions by the Legislature. The work was, however, taken up again in 

 1851, and the final reports were published in 1858. This was the great 



