Geology and Mineralogy. 405 
Among other points discussed are the 2 Cork speeds of 
rotation of the several planets, and the probable effects of the 
eee of : satellite on the course of change afterwards followed 
ya — 
ae ends with a review of the solar system, in which it 
is iiows that the tidal hypothesis is a means of codrdinating 
many apparently Se phenomena, besides eine a history 
of the earth and m e the origin of the lat 
These in aiidetnitins afford no grounds for the. rejeotion of the 
nebular hypothesis, but while they present evidence in favor of 
the main outlines of that theory, they introduce args astogo . 
i al fri 
influence ni bai of reat, and in one instance of even para 
mount importance, in determining the present condition of the 
ec a and of their satelli 
Sight: An Exposition of the Principles of Monocular and 
Dante Vision; by Joserpu LeConrr, LL.D. 275 pp. 8vo. 
ew York, 1881. (D. oe & Co. international eae 
ect to which the author has contributed muc , his own 
ytd (see numerous articles in this Meteo The develop- 
ment of this subject is a feature of the volume, and gives it 
especial value, although it may Sabie seem to some that other 
topics of no less inter est are sacrificed to 1 
II. GkoLoGy AND MINERALOGY. 
along the St. Gothard Tosi el.—A brief notice of this section by 
the past year an account of the rocks has been published by M. 
Stapff, as an Appendix to the Report of the Swiss Federal Coun- 
cil. A few facts are here cited from Professor Favre’s Review o 
Swiss le 3 a 1880, published in the Geneva Archives des 
Sciences, Feb 
The section is ie 920 meters long. The northern, 2010 meters, 
are through the mass of the Finsteraarhorn; fro m 2010 t to 4325 
meters through the fold of Ursern; from 4325 to 11,742 meters 
through the mass of St. Gothard; and the remaining 3178 meters 
through the fold of Tessin, The rock of the mass of the Finster- 
aarhorn is a gneissoid granite (made of quartz, orthoclase, some 
n 
er 
region of the gray gneiss. In the fold of Ursern, made up of sev- 
eral secondary folds, the center consists of cipolin or calcareous 
