932 Reviews—Bibliotheca Chemico-Mathematica. 
BIBLIOTHECA CHEMICO-MATHEMATICA. CATALOGUE OF WORKS IN 
MANY ToneuES ON Exact aND APPLIED SclENCE. Two 
Volumes. Sotheran, 1921. £3 3s. 
ate work is the result of fourteen years’ labour. It is probably 
the finest historical catalogue of science published in any 
country, containing, as it does, over 17,000 items, with current 
prices, bibliographical particulars, and many biographical and 
historical references. The reproductions of old illustrations, of which 
there are 127, are particularly fascinating, especially those of early 
ideas for steam engines, methods for “* perpetuum mobile”’, etc. 
It is certainly a work which should be found in every scientific 
and reference library. 
Tue Ore Deposits or Utan. By B.S. Butuer, G. F. Lovesuin, 
V. C. HerKes, and others. Professional Paper 111, U.S. Geol. 
Survey. pp. 672, with 57 plates and 74 text-figures. 1920. 
Ti the vast mass of geological literature, with an economic 
bearing, issued by the United States Survey, it 1s difficult and 
somewhat invidious to select individual publications for detailed 
notice. Nevertheless, no excuse is required for drawing the attention 
of British geologists to the admirable summary of the geology of 
Utah provided in the first hundred pages of this memoir. This 
State must always be classical ground in the history of physio- 
graphical and structural geology, and may be regarded as the typical 
example of its class ; likewise it has been exhaustively studied by 
so many famous geologists, of whom we shall only mention G. K. 
Gilbert, whose memoir on the Geology of the Henry Mountains is 
fundamental on the physiographic and structural sides of the 
science. Itis, therefore, highly valuable to have in a condensed form 
the results of these earlier labours as illuminated by more recent 
investigations. 
The remaining, and by far the larger, part of the memoir 1s occupied 
by a detailed account of the economic products of the State, with a 
detailed description of the geology of each mining area. 
THe LimEesToNE Resources oF THE Union. Vol. IL: THe Lime- 
STONES OF NATAL, CAPE AND ORANGE FREE STATE PROVINCES. 
By W. Wysereu, Geological Survey of the Union of South 
Africa. pp. 149, with 2 figures. 1920. 
(plete first part of this publication was reviewed in the GEOLOGICAL 
MaGazine, 1918, p. 522. The present and concluding part gives 
a full and detailed description of all the known occurrences of 
calcareous rocks likely to be of commercial importance in the three 
southern provinces of the Union, except the dolomitic marbles of Port 
Shepstone, which were fully described in the earlier volume. Hxcept 
for this occurrence, Natal is sparingly supplied with limestones, 
