144 NATIONAL ACADEMY OF SCIENCES 



nation of their strata before the Neuchatel Society of Natural 

 Sciences in December, 1841, the substance of which was cited by 

 Agassiz in his " Systeme Glaciaire " in 1847. 



In 1839 Guyot returned from Paris to Neuchatel, joined the 

 Society of Natural Sciences, and accepted the chair of history and 

 physical geography at the post-graduate school known as the 

 " Academy." Here he remained for ten years, during which 

 time he engaged in extensive investigations; " meteorologic, 

 barometric, hydrographic, orographic and glacialistic." For 

 seven years his principal work related to the Swiss erratic 

 boulders. His results were to have appeared in the second 

 volume of Agassiz's work on glaciers, but unfortunately the 

 enterprise was terminated abruptly by the outbreak of the 

 revolution of 1848. The Academy was suppressed, and the pro- 

 fessors, including Guyot, were left without occupation. Guyot 

 was urged by Agassiz to come to the United States, which he 

 finally decided to do. He arrived in August, 1848, and the 

 following winter delivered a course of lectures before the Lowell 

 Institute in Boston on " Comparative Physical Geography," 

 which he spoke of as " a brief epitome of his teaching in 

 Neuchatel." They were delivered in French and afterward 

 translated into English by Professor Felton, and published under 

 the title of " Earth and Man." 



After this time Guyot was occupied for six years, under the 

 auspices of the Massachusetts Board of Education, in lecturing 

 to teachers on geography and methods of teaching, and also 

 prepared a series of geographies and maps for schools which had 

 a very extensive use throughout the country. 



In 1854 Guyot was appointed Professor of Physical Geog- 

 raphy and Geology at Princeton. Besides carrying on his pro- 

 fessional duties, he lectured in the State Normal School of New 

 Jersey, and the Princeton and Union Theological Seminaries. 

 He delivered two courses of lectures at the Smithsonian Insti- 

 tution, one in 1853 on the " Harmonies of Nature and History," 

 and the second in 1862 on " Unity of Plan in the System of Life." 

 He also interested himself at Princeton in organizing a museum, 



