148 Scientific Intelligence. 
The augitic rock consists of crystalline grains of augite and 
labradorite with grains of titano-ferrite [a titaniferous magnetite ?], 
and often also of chrysolite. Owing to the amount of iron in the 
rock, its decomposition has produced beds of pisolitie limonite, 
No distinct remains of voleanic cones can now be distinguished in 
the region. 
4, Report of the Geological Survey of Missouri, including 
jlauct of 1873-4, with 91 Visietrstions and an At tlas ; by Gar- 
LAND - BRoApHEAD, State Geologist. 734 pp. 8vo. Jefferson 
only on a small scale for many years. In 1823 the annual yiel 
was reported at 3,000,000 pounds; in 1878 it reached 27,676,320 
pounds. The first iron was made in 1816; the first zine, in 1367. 
The Lower Drift includes large boulders of granite, red quartzyte, 
greenstone, etc., which increase in quantity and size as we go 
north, In Sullivan County, a granite boulder measures 20 by 24 
mostly rounded, as if by stream action. It is very probable that, 
anterior to the deposit of this rounded drift, but subsequent to the 
age of deposit on the highest land, an immense lake covered the 
is 
and a portion of the border counties, while all Central and South- 
ern Missouri formed an extensive area of dry land. We have evr 
dence in North Missouri of great erosion previous to the existence 
of this immense lake. 
The se is area of the Missouri coal-field is estimated at 23,100 
cause needless confusion. The « reater Soares and better de- 
soils, economic minerals and rocks, and topographical features of 
the southwest coal field, there follow over three yrs pages of 
county reports. The fo ollowing chapters, on lead, z ¢ and iron 
ores, by Schmidt and Leonhard, give many jatdnoitoe ; details pe 
cerning the occurrence and relations of these ores. At Jo ope 
Oronogo, the galenite is pins ponage associated with bitumen, whic 
sometimes entirely impregnates the ore. is bituminous galenite 
has a darker appearance than the common ore, being often dee 
black in color. Bitumen is of quite common occurrence in the 
