of Ed in b urgh , S^ss io i i 1875-76. 
7 
through five editions in a very short time— each edition contain- 
ing a large amount of new matter. The work, by these numerous 
additions, became so changed in character, that he reconstructed 
it, and brought out a new work called “Elements of Geology,” 
and greatly altered his “ Principles ” as regards arrangements. 
In the latter, he presented explanations of the various forces at 
work in the earth and in the universe likely to affect the earth. 
In the former, he described the observed effects. Subsequently he 
brought out the “Student’s Manual of Geology,” in which he 
brought together most of the facts mentioned in the two previous 
works. 
No geologist before LyelPs time had devoted himself so exclu- 
sively and so laboriously to the science. He not only kept himself 
acquainted with the discoveries made by others, but he travelled 
over large portions of the earth’s surface, with the view of verify- 
ing alleged facts, and making di coveries himself. 
He went to Norway, Sweden, Belgium, Switzerland, Germany, 
Spain, Catalonia, and the Danish islands of Seeland and Monen. 
He was twice in America. On the first occasion, in 1841, he went, 
in compliance with an invitation, to deliver a course of lectures at 
Boston. He then remained in the New World a whole year, his 
explorations extending from Canada through the States to the 
mouths of the Mississippi. On returning to England, he pub- 
lished his “ Travels in North America,” in which, whilst geological 
information chiefly is given, some useful views occur on other 
subjects also. In 1845 he paid a second visit to America, and 
examined more particularly the Southern States and the coasts 
bordering the Gulf of Mexico. On his return to England, he 
published his “Second Visit to the United States,” — a companion 
to his former work. 
The most recent of Lyell’s important works was his “ Antiquity 
of Man,” which went through four editions, the first having come 
out in 1863, the last in 1873. But beside these elaborate works, 
he published numerous memoirs, most of which had been read at 
meetings of the Geological Society and British Association for the 
Advancement of Science. 
In 1836, and also in 1850, he was President of the London 
Geological Society. The "Royal Society’s Copley Medal was awarded 
