362 Reviews—Prof. Kayser’s Text-book of Geology. 
Under ‘‘Cambro-Silurian Rocks” the author gives an epitome of 
what has taken place with regard to the subdivisions adopted b 
Sedgwick, Murchison, the Geological Survey, Lyell and finally 
Lapworth. The general consensus of opinion seems now to be in 
favor of the acceptance of Professor Lapworth’s tripartite division : 
Downtonian 
SILURIAN Salopian 
Valentian 
Bala Series 
Llandeilo 
Arenig and Llanvirn 
ORDOVICIAN | 
Tremadoc Slates 
Lingula Flags: Olenus Beds 
Menevian y : ‘ 
CAMBRIAN Harlech, &c. } Paradoides Beds 
Comley Sandstone: Olenelius Beds 
Caerfai group 
Under each subdivision the English and Foreign equivalents will. 
be found together, with upwards of a hundred figures of the 
characteristic fossils that mark the several stages. 
Thirty-six pages are devoted to the Devonian System, principally 
based on foreign localities; but a summary is given of (1) the 
succession of beds in North and South Devon, consisting of a series 
of slaty, sandy, and calcareous beds, which in all points resemble 
that of the continent, and (2) a thick red sandstone series, distin- 
guished by a rich and peculiar fish fauna, the Old Red Sandstone. 
The author gives tables of the Devonian rocks as shown in the 
Rhine area; the Ardennes; in Thuringia and in the Alps; in 
France; Spain and Portugal; in Bohemia; the Urals in Russia ;. 
and in North America. The Paleontology is carefully dealt with 
and illustrated by upwards of seventy wood-cut figures of fossils. 
Thirty-eight pages are devoted to the Carboniferous System and 
its paleontology, with sixty illustrations besides sections of strata. 
The Permian is next described, special attention being given to- 
its Huropean development, it having been known longest in Central 
Germany, especially about Mansfeld, where, for centuries, important 
mines have been worked in the Permian Kupferschiefer, and where- 
the old names, Rothliegende and Zechstein, had their origin. 
Its distribution in Germany, France, Britain, Russia, the Alps, 
Sicily, Asia, America is given; it is also recorded from Spitzbergen 
and New Scotland, Australia, India, and Africa. Upwards of thirty 
figures of Permian fossils are introduced. 
III. The Mesozoic or Secondary group commences with the Trias, 
to which forty-one pages are devoted. Stress is laid on the great. 
difference between the ““German”’ and “ Alpine ” facies of the Trias ; 
in the former, with the exception of the calcareous Muschelkalk, the 
beds are mainly sandy or argillaceous rocks,—in England indeed 
these form almost the whole series. In the Alps, on the other hand, 
the sandy rocks are very much reduced in comparison with the- 
massive pure limestones, dolomites, and mazrls. 
In Germany only the Muschelkalk contains a fauna of any abund- 
