Geology and Mineralogy. 149 
8. The Geological and Natural History Survey of Minnesota; 
4th Annual Report, for 1875 ; by N. H. WincHELL, State Geologist, 
assisted by M. W. Harrineron. 162 pp. 8vo. St. Paul, Minn. 
876.—This report contains a Report on Fillmore County, by 
Prof. Winchell, and others, on Olmstead, Dodge and Steele Coun- 
ties, by Mr. Harrington, together with a long table of railroad 
b 
in diameter. The St. Lawrence limestone, Jordan sandstone and 
Shakopee limestone underlie the St. Peters sandstone and corres- 
pond to the Lower Magnesian limestone. 
9. Revue de Géologie of Messrs. Delesse and Lapparent. Vol. 
xu for 1873 and 1874, 224 pp. 8vo. 1876. (P. Savy, éditeur).— 
A very convenient volume for the geologist, posting up the new 
facts and discoveries in lithological, stratigraphical and dynamical 
geology. We cite from it the following observations: 
M. Gérardin has shown that the waters of subterranean streams, 
feeding artesian wells, contain no oxygen, as Péligot had before 
shown to be true of the water of Grenelle. 
According to M. Ed. Jannettaz, the conductibility for heat of 
slaty rocks is much the greatest in the direction of the slaty struc- 
ture. Thus the ratio is in a talcose slate (a hydromica slate ?) 
from the United States 2-007; in argillyte (phyllade) 1°988; mica 
schist from Aurillac (Cantal) 1°82; in a ferruginous talc slate (hy- 
dromica slate?) making part of the itacolumites of Guyanne, 1°87 ; 
sas vy tn of Angers, 1°6 
euse and Cape Fear River in North Carolina, and of a line to 
connect the waters of Norfolk Harbor in Virginia, with the 
tae of Cape Fenr River at or near Wilmington in North 
arolina ; by Mr. S. T. Apert, U. S. Engineer. Engineer 
tai * Senate Ex. Doe., 44th Congress, No. 35.—This Report con- 
ams much valuable matter on the physical features of the coast 
— of North Carolina and Virginia, and of the changes which 
ee € origin of those changes. 
Jour. Sct.—Tarrp Serres, Vou. XII, No. 68.—Aveust, 1876. 
10 
