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, 
