Geology and Mineralogy. 135 
conclusions are drawn that the movement diminishes in ratio 
toward the sides, bottom, and extremity of the glaciers; and 
when the course bends, so that one side is convex and the other 
concave, the movement is most rapid on the convex side. 
T are only a few of the results brought out in this Memoir. 
Tt is illustrated by a map and diagrams, and also by a photo- 
graphic plate made up of nine photographic views of the Norwe- 
gian glaciers, 
4, 
a for 
lower Switzerland to the J uras, and lodged boulders on these 
mountains, and that Prof. Guyot followed the lines of these bould- 
ers from the Juras across the plain to their sources in the Alps. 
Messrs, Falson and Chantre have recently traced the path of this 
glacier all the way from Lake Geneva, southwestward to Lyons, 
passing by Seillon, Chatillon, Ars and Sattonay, and even ten miles 
farther south, to Vienne in Dauphiny. In its course, after being 
Jomed by the glacier o. the Arve (of which the Mer de Glace was 
one of the sources), it encountered the local glaciers of some of the 
valleys of Bugey; but it ended in surmounting the latter and 
depositing its moraines ot crystalline rocks over their moraines of 
eemetone rocks.— Bibl Univ., 1870, xxxviii, 118, and Bull. Soe. 
col, : 
showing that the denudation was not due to 
the east-and-west course of the Magellan straits. e two heads 
of the narrowest part of the straits are beautifully polished and 
rounded. Similar glacial effects were observed in Borgia Bay ; 
Sreater extension than now. 
rot. Agassiz concluded from the character of the north and 
South sides of the summits in Fuegia, and other facts, that the 
tho’ement of the ice was to the north, and independent mainly of 
© present slopes of the land. 
The region ne which Prof. Agassiz states that he observed 
Slacial phenomena in southern South America includes all of the 
