SKETCH OF HENRY DARWIN ROGERS. 259 



lar Science Monthly, of James Blytlie Rogers, the eldest of them, 

 in the June number, and of Robert Empie Rogers, the fourth, in 

 October, 1896. 



Henry Darwin Rogers, the third of the brothers, was born 

 in Philadelphia, August 1, 1808, and died near Glasgow, Scotland, 

 May 29, 18G6. His middle name was given him in honor of Eras- 

 mus Darwin, of whose poem, The Botanic Garden, his father was 

 a great admirer. He was educated at Baltimore and at Williams- 

 burg, Va., where his father was Professor of Natural Philosophy 

 and Mathematics in William and Mary College from 1819 till 

 1828, the year of his death. The first notice we find of Henry's 

 early work is the mention in Dr. Ruschenberger's sketch of a school 

 set up by him and his brother William in the suburbs of Balti- 

 more. In January, 1830, when he was not yet twenty-two years 

 old, he was elected Professor of Chemistry and Natural Philosophy 

 in Dickinson College. During the year in which he held the pro- 

 fessorship he edited a monthly scientific magazine. The Messenger 

 of Useful Knowledge, to which his brother contributed a series of 

 short articles on the Formation of Dew, and in which educational, 

 literary, and political articles and selections from foreign journals 

 were also published. He resigned his professorship at the end of 

 the year, and in 1831 went with Robert Dale Owen to England, 

 where, with aid afforded him by his brother William, he studied 

 chemistry in the laboratory of Dr. Edward Turner, and attended 

 other scientific lectures in London, including those of De la Beche 

 on geology. He returned to Philadelphia in the summer of 

 1833, and in the ensuing winter delivered a course of lectures on 

 geology in the hall of the Franklin Institute. He was made a 

 member of this society, on the nomination of Alexander Dallas 

 Bache, in January, 1834; was a member of its Board of Man- 

 agers from 1838 till 1843 ; and resigned his membership in it in 

 March, 1848. 



Having received the degree of Master of Arts from the Uni- 

 versity of Pennsylvania in 1834, he was elected Professor of Geol- 

 ogy and Mineralogy in that institution in 1835. This chair he 

 held giving regular instruction till 1846, when he resigned. 

 One of the fruits of his labors there was the small publication, A 

 Guide to a Course of Lectures on Geology, delivered in the Uni- 

 versity of Pennsylvania. 



In 1835 Mr. Rogers was appointed by the Legislature of that 

 State to make a geological and mineralogical survey of New 

 Jersey. He published a small preliminary report of the progress 

 of his work in 1836, and in 1840 a larger report, with maps, 

 entitled Description of the Geology of the State of New Jersey. 

 The report of 1836 gave the first descriptive section that was 

 made of the cretaceous formation of that State, and the first pub- 



