1885.] ltfco [Ruschenberger, 



dependent System of Strata. Proc. Amer. Geol. and Nat. Assoc., 1845, 

 pp. 66-67. 



On the Geology of Pennsylvania. Brit. Assoc. Rep., 1848 (pp. 2), pp. 

 74-75. 



On the structural features of the Appalachians, compared with those 

 of the Alps and other disturbed districts of Europe. Proc. Amer. Assoc, 

 1849, pp. 113-118. 



On the Analogy of the Ribbon Structure of Glaciers to the Slaty Cleav- 

 age of Rocks. Proc. Amer. Assoc, 1849, pp. 181-192. 



On the Origin of the Drift, and of the Lake and River Terraces of the 

 United States and Europe, with an examination of the Laws of Aqueous 

 Action connected with the Inquiry. Proc. Amer. Assoc, 1849, pp. 239- 

 255. 



On the Coal Formation of the United States and especially as developed 

 in Pennsylvania. Proc. Amer. Assoc, 1850, pp. 65-70. 



On the Connection of the deposits of Common Salt with Climate. Proc. 

 Amer. Assoc, 1850, pp. 126-127. 



On the Position and Character of the Reptilian Foot-prints in the Car- 

 boniferous Red Shale Formation of Eastern Pennsylvania. Proc. Amer. 

 Assoc, 1850, pp. 250^251. 



On the Origin of Salt and Salt Lakes. Edin. New Phil. Journ., li, 1851, 

 pp. 130-132. . 



On the probable Depth of the Ocean of the European Chalk Deposits. 

 Proc. Boston Nat. Hist. Soc, iv, 1853, pp. 297-298 ; Silliman, Journ., xvii, 

 1854, pp. 131-132. 



On the Epoch of Elephas primigenius. Proc. Boston Nat. Hist. Soc, v, 

 1854-56, pp. 22-23. 



On Fossil Impressions in Red Shale of Anthracite Coal Measures of 

 Pennsylvania. Proc. Boston Nat. Hist. Soc, v, 1854-56, pp. 182-186. 



On the Geology and Physical Geography of North America. Proc. Roy. 

 Inst., ii : 1854-58, pp. 167-187. 



On the correlation of the North American and British Palaeozoic Strata. 

 Brit. Assoc. Rep., 1856 (pt. 2), pp. 175-186. 



Classification of the Metamorphic Strata of the Atlantic Slope of the 

 Middle and Southern States. Proc. Boston Nat. Hist. Soc, vi, 1856-59, 

 pp. 140-145. 



Introductory observations to L. Lesquereux's paper on New Species of 

 Fossil Plants, from the Anthracite and Bituminous Coal Fields of Pennsyl- 

 vania. Boston Journ. Nat. Hist., vi, 1857, pp. 409^413. 



On the Laws of Structure of the more disturbed Zones of the Earth's 

 Crust [1856]. Edinb. Roy. Soc Trans., xxi, 1857, pp. 431-472. 



On the Origin of the "Parallel Roads " of Lochaber. Proc. Roy. Inst., 

 iii, 1858-62, pp. 341-345. 



The Geology of Pennsylvania ; A Government Survey. By Henry 

 Darwin Rogers, State Geologist; Professor. of Natural History in the 

 University of Glasgow; F.R.S.E. ; F.G.S. ; Member of the American 



