130 Gregory — Progress in Interpretation of Land Forms. 



ber of articles and reviews dealing with geology show 

 that the interpretation of land forms as products of 

 subaerial erosion began in France and French Switzer- 

 land during the later part of the 18th century as a phase 

 of the intellectual emancipation following the Revolution. 

 Scotland and England assumed the leadership for the 

 first half of the 19th century, and the first 100 volumes of 

 the Journal show the profound influence of English and 

 French teaching. In America, independent thinking, 

 early exercised by the few, became general with the 

 establishment of the Federal survey, the increase in uni- 

 versity departments, geological societies and periodi- 

 cals, and has given to Americans the responsibilities of 

 teachers. 



Bibliography. 



1 Wilson, J. W., Bursting of lakes through mountains, this Journal. 3, 

 253, 1821. 



2 Whitney, J. D., Progress of the Geological Survey of California, this 

 Journal, 38, 263-264, 1864. 



3 Playfair, John, Illustrations of the Huttonian theory of the earth, Edin- 

 burgh, 1802. 



4 Kain, J. H., Remarks on the mineralogy and geology of northwestern 

 Virginia and eastern Tennessee, this Journal, 1, 60-67, 1819. 



5 Hitchcock, Edward, Geology, etc., of regions contiguous to the Connect- 

 icut, this Journal, 7, 1-30, 1824. 



6 Buckland, Wm., Reliquiae diluvianae, this Journal, 8, 150, 317, 1824. 



7 Phillips, John, Geology of Yorkshire, this Journal, 21, 17-20, 1832. 



8 Scrope, G. P., Excavation of valleys, Geol. Soc, London, No. 14, 1830. 



9 Hayes, G. E., Remarks on geology and topography of western New 

 York, this Journal, 35, 88-91, 1839. 



10 Seventh Meeting of the British Association for the Advancement of 

 Science, this Journal, 33, 288, 1838. 



u Darwin, Charles, Geological observations on the volcanic islands and 

 parts of South America, etc., second part of the Voyage of the "Beagle," 

 during 1832-1836. London, 1844. 



12 Hildreth, S. P., Observations, etc., valley of the Ohio, this Journal, 29, 

 1-148, 1836. 



13 Geddes, James, Observations on the geological features of the south 

 side of Ontario valley, this Journal, 11, 213-218, 1826. 



14 Conrad, T. A., Notes on American geology, this Journal, 35, 237-251, 

 1839. 



15 Warren, G. K., Preliminary report of explorations in Nebraska and 

 Dakota, this Journal, 27, 380, 1859. 



16 Lesley, J. P., Observations on the Appalachian region of southern 

 Virginia, this Journal, 34, review, 413-415, 1862. 



17 Hitchcock, Edward, First anniversary address before the Association 

 of American Geologists, this Journal, 41, 232-275, 1841. 



18 Dana, J. D., On denudation in the Pacific, this Journal, 9, 48-62, 1850. 

 , On the degradation of the rocks of New South Wales and 



formation of valleys, this Journal, 9, 289-294, 1850. 



19 Hubbard, O. P., On the condition of trap dikes in New Hampshire an 

 evidence and measure of erosion, this Journal, 9, 158-171, 1850. 



20 Hayden, F. V., Some remarks in regard to the period of elevation of 

 the Rocky Mountains, this Journal, 33, 305-313, 1862. 



