REVIEWS 287 



distribution in the United States. It is concerned chiefly with the 

 production, methods of mining, and manner of miUing of graphite in 

 Pennsylvania. 



T. T. Q. 



The Geography and Industries of Wisconsin. By Ray Hughes 



Whitbeck. Wisconsin Gaol, and Nat. Hist. Survey Bull. 



No. 26. 1913. Pp. 94, pis. 20, figs. 48. 



This bulletin is essentially a geographical treatise on the natural 



resources of the state. It is designed primarily for use in the schools. 



The mineral production, forest industries, agriculture, manufacturing, 



and transportation are all in turn discussed with relation to indigenous 



opportunities and necessities. The volume is well calculated to meet 



the needs of those for whom it was written. 



T. T. Q. 



Krystallisationskraft. By Raphael Ed. Liesegang. Naturwis- 

 senschaftliche Umschau, No. 12, Beilage der Chemiker- 

 Zeitung, 1913, Nos. 154, 155. 



This article contains a brief summary of the work of various writers who 

 have contributed, since 1836, opinions or experimental data on this subject- 

 Mention is made of the work of Bruhns and Mecklenburg, who used potassium 

 nitrate and alum solutions and reached the conclusion that capillarity and 

 adsorption were probably more important factors than the force of the growing 

 crystals. They found under conditions of alternate wetting and drying that 

 the movement due to capillarity was actually complete before crystallization 

 took place. 



The author does not believe that the force of growing crystals can be con- 

 sidered a factor in geologic processes. 



E. A. S. 



Useful Minerals of the United States. By Samuel Sanford and 



Ralph W. Stone. U.S. Geol. Surv. Bull No. 585. Pp. 250. 



Washington, 19 14. 



This bulletin contains alphabetical lists of the useful minerals occurring 



in each of the states, with the localities in each state where each is found. A 



glossary and mineral index of thirty pages is appended. 



A. D. B. 



