walcott.J LITERATURE. 25 



1840. 



Conrad, T. A. On the Silurian system, with a table of the strata and characteristic 



fossils. Am. Jour. Sci., vol. 38, 1840, pp. 80-93. 

 Emmons, Ebenezer. Fourth annual report of the survey of the second geological 



district of New York. Fourth annual report of the geological survey of New 



York', Albany, 1840, pp. 259-353. 

 Houghton, Douglass. Third Ann. Rep. State Geol. of Michigan. House Reps. 



Document No. 8. 1840, pp. 33. 

 Rogers, Henry D. Description of the geology of the State of New Jersey, being a 



final report. Philadelphia, 1840, with plate and map. pp. 301. 

 Fourth annual report on the geological survey of the State of Pennsylvania. 



Harrisburg, 1^40, pp. 252. 

 Troost, Gerard. Fifth geological report on the State of Tennessee. Nashville, 



1840, pp. 44, 3 maps. 



Vanuxem, Lardner. Fourth annual report of the geological survey of the third 

 district. Fourth report of the geological survey of New York, Albany, 1840, 

 pp. 355-383. 



1841. 



Conrad, T. A. Fifth annual report on the paleontology of New York. Fifth annual 

 report of the geological survey of New York, Albany, 1841, pp. 25-57. 



Emmons, Ebenezer. Geology of the Montmorenci. American Magazine, vol. 1, 1841, 

 pp. 146-150. 



Gesner, Abraham. Third report on the geological survey of the Province of New 

 Brunswick. St. John, 1841, pp. 88. 



Hitchcock, Edward. Final report on the geology of Massachusetts, 2 vols., Amherst, 



1841, vol. 1, pp. xn, 299; vol. 2, pp. 300-831 ; 55 pis. 



Houghton, Douglass. Report [on the Northern or Upper Peninsula]. Geol. Survey 

 Michigan, 4th Ann. Rep. State geologist, 1841, pp. 4-89. 



Mather, W. W. Fifth annual report on the geological survey of the first geological 

 district. Fifth annual report of the geological survey of New York, Albany, 

 1841, pp. 63-112. 



Rogers, H. D. Some observations on the geological structure of Berkshire, Massa- 

 chusetts, and neighboring parts of New York. Am. Phil. Soc, Proc, vol. 2, 

 1841, pp. 3,4. 



Fifth annual report on the geological exploration of Pennsylvania. Harris- 

 burg, 1841, pp. 156 and plate. 



Troost, Gerard. Sixth annual report of the geological survey of Tennessee by the 

 State geologist. Nashville, 1841, pp. 48. 



1842. 



Conrad, T. A. Observations on the Silurian and Devonian systems of the United 

 States, with descriptions of new organic remains. Phila. Acad. Sci., Jour., 

 vol. 8, 1842, pp. 228-235. 



Emmons, Ebenezer. Geology of New York, part 2, comprising the survey of the 

 second geological (northern) district, 1842, pp. 438, pis. 17. 



— : Topography, geology, and mineral resources of the State of New York. 



Gazetteer of the State of New York, by J. Disturnell, Albany, 1842, pp. 5-25. 



Rogers, H. D., and W. B. Rogers. On the physical structure of the Appalachian 

 Chain, as exemplifying the laws which have regulated the elevation of great 

 mountain chains generally. Brit. Assoc. Rept., vol. 12, Trans. Sec, pp. 40-42; 

 Am. Jour. Sci., vol. 44, 1842, pp. 359-362; Trans. Am. Assoc. Geol. and Nat., 

 1843, pp. 474-531. 



Vanuxem, Lardner. Geology of New York. Geology of the Third (central) Geo- 

 logical District. Albany, 1842, pp. 307. 



1843. 



Gesner. Abraham. Report on the Geological Survey of the Province of New Bruns- 

 wick, with a Topographical Account of the Public Lands and Districts Ex- 

 plored in 1842. St. John, 1843, pp. 88. 



r- Memoir of the Geology of Nova Scotia, with a map. Geol. Soc. London, Proc, 



Vol. 4, 1843, pp. 1*6-190. 



Hall, James. Geology of New York. Geology of the Fourth (western) Geological 

 District. Albany, 1843, pp. xxvii, 686, 19 pis. and map. 



