ee eS a S E 
von Giimbel. Cassel 
1886. | Mineralogy and Petrography. 1047 
tiles, Actinodon, Protriton and Stereorachis, are now known from 
these beds. 
Secondary.—The central region of Tunis, according to M. Rol- 
land, consists in great part of a mass of senonian beds with lime- 
stones yielding inocerami and cephalopods. This mass is here 
and there capped by nummulitic beds. These beds are found all 
around the Mediterranean region, but those of Algiers and Tunis 
are characterized by peculiar species. M. Thomas has discov- 
ered beds of phosphate of lime in Tunis. In the south-west are 
rich and very extensive Eocene deposits, while near Feriana there 
is a small bed of Cretaceous age. In the Albian marls of Con- 
_ Stantine, in Algeria, there are notable Cretaceous beds of this 
minera 
Quaternary. —M. Reviere, who at the meeting of the French 
Assoc. Adv. Sci. at Grenoble, in 1885, gave a list of 171 shells 
discovered in the grottoes of Meudon, has this year described the 
fishes and birds. The few fishes found are principally those of 
fresh water, which seems inexplicable among peoples living on 
Th 
the shore of a sea so rich in fishes as the Mediterranean. e 
vertebra of a salmon, a fish of the northern rivers, was found, 
and speaks of the migrations of these Quaternary peoples. 
- MINERALOGY AND PETROGRAPHY 
New Booxs.—The third part of Professor von Giimbel’s “ Ge- 
ologie von Bayern’ has just been received. _Although not yet 
completed, enough of the first volume has already appeared to 
show that the work in its entirety will fill a long felt want. 
this volume the author proposes to set forth the principles of 
geology as generally accepted at the present time, devoting quite 
a considerable portion of the book to the microscopical character- 
istics of rocks, and to the truths which the microscope reveals, as 
well as to the theories to which the use of this instrument has 
given rise. That portion of the book which has already appeared 
is well illustrated by nearly four hundred photo-engravings. Most 
of these illustrations are taken from localities in Bavaria. The 
author, however, has not hesitated to draw on any source that 
would serve his purposes better than those at hand in his own 
country. The result is a most satisfactory text-book of geology, 
in which all the most modern methods of geological research are 
described, and the results to which each leads carefully given. 
The subject of metamorphism has received considerable attention 
_and also the theories relating to “ petrogenesis,” or the origin of 
rocks. The second volume will be devoted to a description of the 
geology of Bavaria The first of a series of monographs on edu- 
} Edited by Dr. W. S. BAYLEY, Madison, Wisconsin. 
* Geologie von Bayern. Bd. 1, Lief, 1, 11, 111, Grundzüge der Geologie. Dr. K. W. 
& , 1884-6. * 
