Geology and Mineralogy. 401 
From these facts the conclusion Ms aie: at that the time of 
eruption was later than the Da and Fort Benton groups 
of the Cretaceous and before the peers 
The rocks of the Hills were examined Lat tit by Mr. 
J. H. Caswell, whose report occupies the last fifty-five pages of 
the volume and is illustrated by two colored plates. The report 
glass, pitchstone, pearlstone, spherulite, ete. yte in 
cludes sanidin-trachyte and sanidi n-oligoe den Gacy ihatirane 
hornblende, magnetite and peta are often n present, and the a - 
tals of biotite have sometimes a border of magnetite. The pho- 
nolite contains much nephelite and some of it ‘hornblende. The 
ga crystals in the Pastas from the top of Warren Peak are 
e to — inches lo 
The ume coun also ag ee on ~ Mineral lags 
and athe WA the Black Hills by Watrser P. Jenney, on the 
botany, by Asa Gray, and on the penta work of the expe- 
dition ind the barometric hypsometry, by H. P. Turrxe. 
2. Primitive Industry, or Illustr ations of the eg ati in 
St one and Clay of the Native Races of the Northern 
Atlantic Seaboard of America; by Cuartes C. Axpportr, 
560 pp., 8vo, Salem, pia cacoes e A, Bates. )—Mr. Abbott has 
done good service to ancient American history in the preparation 
of this well system aasined and well illustrated work, The region 
which he surveys embraces New England a ee the States of New 
York, New Jersey and ee eee but the wide range i his 
ewis, of the Bf BS Survey of Penns via. Dr. 
ee ives drawings of several of the apne discovered, 
describes them a s of hard aepiliiies and more ru made than 
8 
existed here before the i Diese of the ice of the Gla cial era 
—and probably akin to the Eskimo. He refers to the occurrence 
of a tooth of the Henao Sangiter goose from the Trenton 
rof. T. A 
gravels, found by the lat rad; to remains of the 
Same species and of the ae, “in an ordinary pep ace ” near 
Stroudsburg, Pennsylvania, along with f fire that sug- 
gested the idea of a feast on the bison by pee ek - the time; to 
the occurrence in New Jersey of antlers of the Greenland Rein- 
Am. Jour, Sor.—Turep Series, Vou. X XII, No. 131.—NovEMBER, 1881. 
27 
