JOHN WESLEY POWELL 135 



the geology of the High Plateaus of Utah, pp. vii-xiii, 

 Washington, Government Printing Office, 1880, 4°. 



1882. 



18. General [geologic] nomenclature. 



In United States Geological Survey, Second Annual Re- 

 port, pp. xlii-xlviii, Washington, 1882, royal 8°. 



Included in paper-covered separates of Director's report. 



19. Colors for geologic cartography, and conventional char- 



acters for diagrams. 



In United States Geological Survey, Second Annual Re- 

 port, pp. xlix-liv, pis. i-vii, Washington, 1882, royal 8**. 



Included in paper-covered separates of Director's report. 



1883. 



20. Informal remarks on moraines and terraces. By J. W. 



Dawson of Montreal, and J. W. Powell of Washington. 



In Science for September 7, 1883, vol. 2, p. 321, Cam- 

 bridge, Mass., 18S3, 4°. 



The remarks were made at the Minneapolis meeting of the 

 American Association for the Advancement of Science in 

 August, 1883. 



1884. 



21. On the state of the interior of the earth. 



In Science for April iS, 1S84, vol. 3, pp. 480-482, Cam- 

 bridge, Mass., 1 884, 4°. 



Written at the time of the appearance of a new edition of 

 Thomson and Tait's " Treatise on Natural Philosophy," and 

 characterizes the lines of inductive reasoning by which geol- 

 ogists arrive at the conclusion that the earth is not a solid. 



22. On the fundamental theory of dynamic geology. 



In Science for April 25, 18S4, vol. 3, pp. 51 1-5 13, Cam- 

 bridge, Mass., 18S4, 4°. 



1886. 



23. [Letter, dated March 26, 1886, to Dr. Persifor Frazer, 



Philadelphia, secretary, concerning geologic cartog- 

 raphy.] 



In The work of the International Congress of Geologists, 

 and of its committees, published by the American committee, 

 pp. 106-10S, [Berlin?], 18S6, 8°. 



