150 Scientific Intelligence. 
study of these Quaternary deposits, carried on while acting as 
assistant geologist in the survey of the State. The conclusions 
here brought out with regard to the long gravel deposits of the 
larger valleys, which had been called kames, or eskers, are given 
at length in the last volume of this Journal, in an article contrib- 
uted by himself. All parts of the subject are worked up with 
- thoroughness and the facts are given with full details in the vol- 
u ons. 
é as 
von N. v. Koxscnarow.—The monograph of the eminent Russian 
4. Die Glimmergruppe ; 1 Theil, von G. Tschermak.—The me- 
moir by Prof. Tschermak upon the mica family, of which the first 
ical relations to a second paper. The exact determination of their 
optical characters has enabled the author to prove that all the 
micas, although a variation in angle from the orthorhombic form 
may not be established, are nevertheless monoclinic. 
e micas are divided into two groups; with the first the plane 
of the optic ages is perpendicular to the plane of symmetry and 
with the second is parallel to it; they are as follows:— 
— i Anomite. Meroxene, Lepidomelane. 
— Phlogopite, Zinnwaldite. 
Muscovites:—  Lepidolite. ; 
FP 
Margarites:—  Margarite. 
The name Merorene, first introduced by Breithaupt, is em- 
ployed by the author to include all the nlagnesia micas of Wr eivitia: 
and also all other magnesia micas closely related to them and not 
falling into the other divisions. On the other hand the magnesia 
micas which fall into the second class as defined above are called 
anomite (Gr. avouéo) ; in this class falls the mica of L. Baikal, 
and that of Greenwood Furnace, N. Y.— Vienna Academy. 
E. 8. 
dD. 
