328 The American Ge<jlo(jist. May, 1895 
times nearly black, or partly wliitf. It is the rock which in Minnesota 
has been named taconyte, and is illustrated by several plates, in micro- 
scopic section both by Spurr and by Van Hise. It seems to be a kind of 
jasper characteristic of this geological horizon. Mr. Spurr is inclined 
to believe the glauconile is of foraminiferal origin. N. H. w. 
Meteoritenkunde ton E. Cohen. Ileft 1. Uutersuchungsmethoden und 
Charakteristik der Qemengtheile, viit 39 Figureii. (Stuttgart, E. Schweit- 
zerbarfsche Verlagshandlung |E. Kock]. Pp. xiii, 340, octavo, 1804.) 
This volume is only the first of several which have been planned by the 
author, and if they shall all be finally completed he will have reviewed 
every phase of the subject of meteorites. This part is devoted to meth- 
ods of examination and the composition of meteorites. It contains a 
short historical sketch of the chemical results attained by simple chem- 
ical analysis by Howard in 1802. After Howard's researches there fol- 
lowed a large number of analyses of other meteorites, performed by 
Fourcroy, John, Klaproth, Langier, Proust, Stromeyer, Thenard, and 
Vanquelin. These resulted, between 1S03 and 1834, not only in verify- 
ing the discoveries of Howard which had shown a similarity of nature 
and therefore a similarity of origin, but also in the detection of man- 
ganese, chromium, carbon, chlorine, calcium, aluminum, sodium, co- 
balt, potassium and copper. Berzelius added tin in 1834. The author 
gives an interesting sketch of the methods and discoveries of later 
chemical investigators down to 1891. 
A similar sketch is given of the progress of the determination of the 
minerals of meteorites, by chemical and pelrographic methods. Each 
element and each mineral then has its special exposition, in the course 
of which everything that is known of their manner of occurrence and 
their pecuiarities and combinations, is fully detailed, with copious ref- 
erences to literature. Throughout the author has added much original 
matter. 
The work is a thorough compend of the known meteorites of the 
world, and at the same time it is much more than a compilation, in 
that the author has discriminated and condensed, or has criticised and 
enlarged the work of his predecessors by his own investigations. 
N. II. W. 
Oeotektonische. Probleme, von A. Rothpletz. (107 figs., 10 plates, pp. 
175, E. Koch, Stuttgart, 1894.) This volume is devoted to the faulting 
and folding of the rocks of the earth's crust, with illustrations taken 
from the best authorities. In respect to North America the author has 
employed the generalized sections of Rogers for the Appalachians and 
of McConnell for the Rocky mountains. The specinl contributions of 
Willis (Thirteenth report, U. S. G. S.), of Dana in western New England, 
of C. W. Hayes in Alabama and Georgia, of Hobbs in the Housatonic 
valley and of Prof. Safford in Tennessee are brought into the general 
review, and some are illustrated. N- h. w. 
Ofversigt af Kungl. Vdemknps-Akademicus Forhandlingar 1S94. No. 10. 
Stockholm. Dr. G. Lindstrom reports the discovery of a Silurian fish 
