REVIEWS 199 



those who want to go deeper into the subjects treated. We venture to 

 hope that the busy reader will be more fortunate in the use of these 

 references than we have been. To one somewhat acquainted with the 

 general literature of economic geology these lists are more remarkable 

 for what they do not than for what they do contain. What must geolo- 

 gists and mining engineers in any part of the world think of bibliog- 

 raphies with such omissions as the following ? Under Building Stones 

 no reference is made to Merrill ; under Copper no mention of Whit- 

 ney, Irving, or Wadsworth ; under Zinc no mention of Winslow ; 

 under Phosphates and Manganese no mention of Penrose ; under 

 Quicksilver no reference to Becker; under Petroleum and Natural Gas 

 no mention of Carll or Orton ; under Silver no reference to Emmons; 

 and under Diamonds no mention of the writings of Derby. 



The references that are given are often quite irrelevant, and some- 

 times wrong. For example under the list upon "combustible min- 

 erals," p. 405, is this : " 187 1. Hartt. La faune carboniferienne du Mis- 

 souri (Neues Jahrb., p. 63)." The place cited contains a note by Louis 

 Agassiz upon the Carboniferous fauna found by Hartt in South Amer- 

 ica. There is not a word about Missouri, and as a matter of fact there 

 is no coal in the South American Carboniferous area mentioned by 

 Hartt. On p. 406 is this: "1878. Derby. Le carboniferien au Mis- 

 souri (Neues Jahrb., p. 663)." There is no such article at the page 

 cited, and I much doubt Professor Derby's having written such an 

 article at all. On p. 53S the bibliography of kaolin gives a title by 

 Fontannes. Upon looking up the article cited it is found to contain 

 nothing about kaolin. In addition to these defects the typographical 

 errors in the references render many of them worthless. 



The book seems to be intended for a sort of vade mecum on eco- 

 nomic geology, and as such it will be found helpful. It is of conven- 

 ient size and neatly bound in flexible leather. 



J. C. Branner. 



Handbuch der Secnkunde. Allgemeine Litnnologie . Von Dr. F. A. 

 Forel. Stuttgart : Verlag von J. Engelhorn. 

 This volume is one of the series of useful geographic handbooks 

 published under the general editorship of Professor Dr. Friedrich Rat- 

 zel. It brings together in concise, comprehensive, and readable 

 form the general principles of limnology. 



