Geology and Mineralogy. 581 



rotation is a conspicuous feature of the book and will earn the 

 approval of every experienced teacher. It may be a question 

 whether it is not preferable to allow the student to gain first some 

 idea of the dynamics of a particle, and to build upon this the 

 dynamics of rigid bodies, instead of introducing them side-by-side 

 as is done in this book and afterward developing their relations. 

 Some teachers also will regret that the use of the principle of 

 energy is so long delayed. These are, after all, questions of 

 taste and not very important. Taken as a whole, the book is so 

 good and so well suited to its purpose, that one may venture to 

 predict for it a very considerable and well-deserved popularity. 



H. A. B. 



II. GEOLOGY AND MlNERALOGY. 



1. West Virginia Geological Survey. Volume II (a). Sup- 

 plementary Coal Report / by I. C. White, State Geologist. Pp. 

 xiv, 720, with map in pocket. Morgantown, 1908. — In 1903 

 the second volume of the West Virginia Geological Survey was 

 published, giving an account of the coals of the northern part of 

 the state, with also notes in regard to those of the southwestern 

 portion. The present volume, IIa, discusses in all fulness of 

 detail the Great Kanawha and New River coal fields, and those 

 lying between them and the Kentucky line. The two volumes 

 together, therefore, present an exhaustive account of the resources 

 of the state in respect to this important industry. It may be 

 noted that in 1907 some 48,000,000 short tons were produced, and 

 the increase in rate of production at present averages nearly 

 4,000,000 tons per year. A careful survey of the entire state 

 leads to the conclusion that it may be expected to yield somewhere 

 between fifty and sixty billion short tons of commercial coal, and 

 about one-third as much more of impure and bony coal available 

 for the gas engine. Most of the coal now marketed ranks high 

 in calorific value, and some of it is not exceeded by that of any 

 other bituminous coal fields in the world. 



A large map of the state on the scale of seven miles to the 

 inch has been distributed with this volume. It shows the distri- 

 bution of the several coal formations and also the areas of oil, 

 gas and limestone, w^ith the principal anticlinal lines. 



2. Florida State Geological Survey, E. H. Sellards, State 

 Geologist. First Annual Report 1907-8. Pp. 114, with 6 plates. 

 Bulletin No. 1. A Preliminary Report of the Underground Water 

 Supply of Central Florida. Pp. 103, with 6 plates and 6 figures. 

 Tallahassee, 1908 (Capital Publishing Co.). — The first annual 

 report of the Geological Survey of Florida contains the adminis- 

 trative report for 1907-8, by the state geologist, Prof. E. H. 

 Sellards, with a sketch of the geology of the state. An account 

 is also given of the mineral industries, chief of which is the phos- 



