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1883. 



Classification of the Natural Sciences. P. A. A., xxxii, p. 29. Reprinted 



in M. P. & P. 

 Pre-Cainbrian Rocks of the Alps. P. A. A., xxxii, pp. 239-242; Am. 



Nat., xvii, pp. 1099-1102 ; abstract, Science, ii, pp. 322-333. 

 The Serpentine of Staten Island, N. Y. P. A. A., xxxii, p. 242; Am. 



Nat., xvii, p. 1037 ; Science, ii, p. 323. 

 The Decay of Rocks Geologically Considered. S. J., xxvi, p. 190 ; 



Science, i, p. 324 ; Am. Nat., xvii, pp. 645. Read to Nat. Acad. 



Sci., April 17. Reprinted in M. P. & P. 

 Coal and Iron in Alabama. I. M. E., xi, p. 236. Eng. & Mining J., 



xxxv, p. 113; abstracts, School of Mines, Quart, iv, p. 225; 



Science, i, p. 101. 

 On the Pre-Cambrian Rocks of Europe and America. C. N., x (new 



series), p. 126, 127. 

 The Geology of Port Henry, N. Y. C. N., ix, p. 420-422; Sci. Am. 



Supp., viii (No. 195), p. 3096. Read to Am. A. A. S., 1879. 

 Geology. Progress for 1882. Smithsonian Report for 1882, p. 126. In 



part in the Virginias, v, p. 141-161. 

 The Pre-Cambrian Rocks of Wales. Science, ii, p. 403. 

 The Geology of Lake Superior. Science, i, pp. 218, 219. 

 A Historical Account of the Tatonic Question in Geology, with a Dis- 

 cussion of the Relations of theTaconian Series to the Older Crystal- 

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pp. 417-427. 

 Relation of the Natural Sciences. Inaugural address. Can. Royal 



Soc. Trans., i, sec. 3, p. 1. 

 The Geological History of Serpentines, including Notes on Pre-Cambrian 



Rocks. Can. Royal Soc. Trans., i, sec. 4, pp. 165-215. Reprinted 



in M. P. & P. 

 Notes on Prof. James Hall's Address, on the Geological History of the 



American Continent. P. A. A., xxxi, p. 69-71. 

 Historical Account of the Taconic Question in Geology. Can. Royal 



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1884. 



On the Chemistry of the Natural Silicates. B. A. R., p. 679. 



The Origin of the Crystalline Rocks. Can. Royal Soc. Trans., ii (3), 



p. 1. Read before Royal Soc. of Canada. Abstract, S. J , xxviii, 



p. 73. Reprinted in M. P. & P. 

 The Apatite Deposits ot Canada. I. M. E., xii, pp. 459-468 ; E. & M. 



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 Cambrian of North America. Read to Bos. Soc. Nat. His. Am X., 



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