90 Reviews—Guide to Chatk Fossils. 
VIII.—A New Pocxrr-Guive ro Cuark Fossits. Kart WANDERER. 
Diz wicuriesreN TIERVERSTEINERUNGEN AUS DER KREIDE DES | 
Koyiereicnres Sacusen. 8vo; pp. xxii, 80, with 12 plates in 4to 
(folded), and 11 figures in the text. Jena, 1909. Price 3 marks. 
(FVHE plan of this little book is excellent. It provides a tabular 
view of the Chalk of Saxony, a bibliography, a list of places 
where fossils can be obtained, and devotes its eighty pages to short 
descriptions of the fossils, commencing with the Foraminifera and 
ending with the Vertebrata, completing the whole with an alphabetical 
index to the fossils. The text-figures are explanatory diagrams of the 
structural features of regular and irregular Echinoderms, Brachiopods, 
Pelecypods, Gasteropods, and Cephalopods, and the plates provide 
sufficiently good figures of all the fossils described in the text. The 
book is cut to a convenient size for the pocket, and provides the 
worker in the field with a handy means of readily identifying 
the bulk of his finds on the spot. The English collector will find 
this book of considerable value for his own purposes. R 
“C.D: 
IX.—Tup Orv Derosrrs or Sourn Arrica. Part I: Base Metals 
(1908). Part IL: The Witwatersrand and Pilgrimsrest Goldfields 
and similar occurrences. By T. P. Jounson. London: Crosby 
Lockwood & Son, 1909. Price 5s. net each. 
f lie two small volumes are intended for the use of those 
technically connected with the mining industry and as a guide. 
to the prospector. 
In a country of such diversified geological structure as South Africa 
it is difficult to gauge the wants of those interested in the development 
of its mineral resources; but it may be as well, and sufficient, to state 
that the author ignores the stratigraphy of the country, since, in his 
opinion, the ‘‘ principles of ore deposition” are independent of it. 
Considering the high price and small size of these volumes we 
should have expected to find more original subject-matter, more 
carefully prepared maps and sections, and a greater economy of space 
both in the arrangement of the text and of the sections. 
X.—Brier Novices. 
1. JouknaL oF Grotocy (Cuicaco).—In this Journal for October— 
November, 1909, there is an interesting article on the ‘ Physical 
Geography of the Pleistocene, with special reference to Pleistocene 
Conditions”’, by Mr. R. D. Salisbury. He refers to evidence of greater 
depression during the glacial epochs than during the interglacial ; 
also to the effect of increase of altitude on climate, leading to greater 
erosion and to the greater consumption of carbon dioxide whereby the 
temperature became lowered. Decay of rocks was checked by decrease 
of altitude or temperature, or by the accumulation of ice-sheets which 
protected the rock beneath from ready carbonation. The author refers. 
also to the loading of the land-surface with ice over vast areas, to the 
consequent effect on crustal movement, and to the recurrent processes: 
