236 Address before the Association of American Geologists. 



has made six reports : the first of thirty six pages, the second of 

 thirty pages, the third of fifty four pages, the fourth of thirty two 

 pages, the fifth of one hundred and sixty one pages, and the sixth 

 of one hundred and thirty two pages. 



Dr. Charles T. Jackson was appointed state geologist of Maine, 

 in 1836, and he has since made three reports ; the first of one 

 hundred and twenty eight pages, the second of one hundred and 

 sixty eight pages, and the third of three hundred and forty pages. 

 He has also surveyed the public lands of Maine and Massachu- 

 setts, and made two reports. In 1839, the same gentleman was 

 appointed to survey Rhode Island ; and his final report, of three 

 hundred and twelve pages, with a geological map and sections, 

 appeared in 1840. In 1840, he was commissioned to survey New 

 Hampshire, and his first annual report will soon appear. The 

 survey of Connecticut has been made by Dr. J. G. Percival and 

 Prof. Charles U. Shepard. The latter made a report in 1837, of 

 one hundred and eighty eight pages, upon the economical miner- 

 alogy of the state. The report of the former gentleman has not 

 yet been published, but is expected in the course of the ensuing 

 year. The survey of Pennsylvania was begun in 1836, by 

 Prof. Henry D. Rogers, who has made five annual reports ; the 

 first of twenty two pages, the second of ninety three pages, the 

 third of one hundred and nineteen pages, the fourth of two hun- 

 dred and fifty two pages, and the fifth of one hundred and sev- 

 enty nine pages. The survey of Ohio was committed to Prof. 

 Mather, as principal geologist, assisted by Dr. S. P. Hildreih, Profs. 

 John Locke and J. C. Briggs, and J. W. Foster. Their first re- 

 port of one hundred and thirty four pages, was made in 1837, 

 and their second of two hundred and eighty six pages, with nu- 

 merous drawings, in 1838. Delaware commenced this work in 

 1837, under the direction of James C. Booth, Esq., who has made 

 two annual reports of a few pages, and his final report of one 

 hundred and eighty pages, is nearly through the press. In Mich- 

 igan, the survey was committed to Douglass Houghton, Esq., 

 with assistants. His first report of thirty seven pages, was made 

 in 1838, and his three subsequent ones of one hundred and 

 twenty three, one hundred and twenty four, and one hundred and 

 eighty four pages, in successive years. In 1837, Dr. D. D. Owen 

 commenced a survey of Indiana, and he has since published two 

 reports of thirty four and fifty four pages. In Kentucky, the 



