~~ 
‘ Geology and Mineralogy. 421 
Dr. Endlich describes the Sangre de Cristo range and the 
Luis and the Huerfano region. The highest mountains of this 
. : 
c.——may 
boniferous, and he adds, this point is at least “entitled to further 
investigation.” The Aiootoaiton ous ae Cretaceous rocks are 
described and various sections are give The volcanic rocks are 
spoken of as either trachyte, dole coe or basalt. There are six 
volcanic areas situated—near the eastern entrance of the Sangre 
idad regi s of 
says of the coal. Dr. Endlich also discusses the distribution of 
the Ancient Glaciers of Southern Colorado, and illustrates the 
i with a map. 
- Holmes describes the geology of the La Plata mining re- 
n, giving vty daganin oe views and — and stating 
a cts interest ted with the trachytic eruptions. 
Professor adce eater ‘stratigraphic details respecting the 
ert ai Cretaceous 
opographical an nd Geogra aphical Reports treat of the 
courses and heights re es sabe of drainage, i and 
is illustrated by chy outline slichihes which’ are very effective ve. 
The a Report by Mr. Allen, which ae previously 
sppcareds: Ie already been noticed in this Journ Professor 
ackard’s an treats of a subject of the highest stipiaaaibe to 
the country—the injurious pion of the west—and occupies 220 
pages of the volume. He remarks that in the United States the 
loss of agricultural products gies this source is probably — 
two hundred millions of dollars each year, and that from on 
quarter to one-half of this amount might be saved by prev st 
measures. Many figures are added to the text illustrating the 
species. 
