Geology and Mineralogy. 467 



450, with 579 tables and an index. Washington, 1920. — The 

 latest edition of this volume involves a considerable enlargement. 

 Besides the incorporation of new data in the older tables, 172 

 new tables have been added. The scope of the collection has 

 been broadened to include tables on astrophysics, meteorology, 

 geochemistry, atomic and molecular data, colloids, photography, 

 etc. The tables have been radically rearranged so as to effect 

 a more logical order than prevailed in the earlier editions; the 

 present sequence being, — mathematical, mechanical, acoustical, 

 thermal, optical, electrical, etc. Much credit is due to Mr. 

 Fowle and his collaborators for the valuable service which they 

 have rendered to all who are engaged in extending the domain 

 of the physical and allied sciences. h. s. u. 



11. Logarithmic and Trigonometric Tables. Revised Edition; 

 edited by Earle Raymond Hedrick. Pp. xxi, 143. New York, 

 1920 (The Macmillan Co.). — In effecting the revision care has 

 been taken to preserve the page numbers of the principal tables 

 up to page 114, so that older editions may be used in class-work 

 without confusion, and texts which contain the principal tables 

 may be used in the same class. Several tables not contained in 

 the earlier editions have been incorporated in the present volume. 

 Among these may be mentioned: a table of multiples of M 

 and of 1/M, a table of haversines, a table of factors of composite 

 numbers and logarithms of primes, tables for compound interest 

 and discount, annuity tables, etc. Every effort has been made 

 to maintain the high standard of accuracy which characterized 

 the previous editions of this very useful collection of numerical 

 data. h. s. u. 



II. Geology and Mineralogy. 



1. An Introduction to Palaeontology ; by A. Morley Davies. 

 Pp. xii, 414, 100 text figs., London (Thomas Murby & Co.), 

 1920. — The title of this book is somewhat misleading, since it 

 is essentially an introduction to the study of fossil invertebrates. 

 It should be most useful for teaching the morphology of the 

 hard parts of the Brachiopoda, Lamellibranchia, Gastropoda, 

 Cephalopoda, Trilobita, and graptolites. The Cystidea, Blast- 

 oidea, sponges, and corals, however, are not described as 

 thoroughly as is needed, while the Bryozoa, Insecta, worms, and 

 Arthropoda (other than trilobites) are only briefly defined. 

 It is well that even invertebrate paleontologists should know 

 something of the vertebrates and plants, and thirty-three pages, 

 with a few illustrations, are devoted to these. The chapters' on 

 the collection and preservation of fossils, the rules of nomen- 

 clature, and the divisions of geological time are good and highly 

 useful. In general, the faook is a commendable one, especially 

 because of the easy and interesting way in which the organisms 



