26 PROCEEDINGS OF THE AXX ARBOR MEETING 



into the investigation of sediments with particular reference to climatic 

 influences, and his papers bearing dates 1906-1914 show a decided change 

 from the viewpoint and the precise methods of the engineer and petrog- 

 rapher. Another change of emphasis is shown in the publication of the 

 series of papers on the strength of the earth's crust, in 1914-15. In the 

 publications since that time BarrelFs two absorbing interests, origin of 

 sediments and geophysics, are about equally represented. The bibliog- 

 raphy includes no titles which would ordinarily be classed as popular 

 articles. The nearest approach are the five papers which appeared in 

 1917-1919, and it is significant to note that these contributions were the 

 response to definite local requests. 



Published Works 



1899. Rocky Mountain mine surveying : Some convenient methods which are 



especially suited to the conditions there met. Mines and Minerals, 



volume 19. pages 241-244. 

 Corrections for errors in mine surveying. Ibid., volume 19, pages 433- 



437. 

 Stope books. Methods for keeping precise records of stopes. Ibid., 



volume 20. pages 97-100. 



1900. The real error of a survey. Some notes on the accuracy of surveys in 



inclined seams and an analysis of the sources of error. Ibid., volume 

 20, pages 299-301. 

 Surveys in inclined shafts. Theoretical and practical considerations 

 governing the choice of instruments. Ibid., volume 20, pages 420-421. 



1902. Microscopical petrography of the Elkhorn mining district, Jefferson 

 County, Montana. United States Geological Survey, 22d Annual Re- 

 port, part 2. pages 511-549. 

 The physical effects of contact metamorphism. American Journal of 

 Science (4), volume 13, pages 279-296. 



1904. Recent studies of the moon's features. Ibid., volume 18. pages 314-318. 



1906. Relative geological importance of continental, littoral, and marine sedi- 



mentation. Journal of Geology, volume 14, pages 316. 356, 430-457, 

 524-568. 



1907. Geology of the Marysville mining district. Montana : a study of igneous 



intrusion and contact metamorphism. United States Geological Sur- 

 vey. Professional Paper 57, 178 pages. 16 plates. 

 Origin and significance of the Mauch Chunk shale. Bulletin of the 

 Geological Society of America, volume 18, pages 449-476. Abstract in 

 Science, new series, volume 25. page 766. 



1908. Relations between climate and terrestrial deposits. Journal of Geology, 



volume 16, pages 159-190, 255-295. 363-3&4. 



1909. Fair play and toleration in criticism. Science, new series, volume 30, 



pages 21-23. 



1910. Influence of earth shrinkage on the distribution of continental seas. 



In "Paleogeography of North America," by Charles Schuchert. Bui- 



