REVIEWS. 339 



mapping of the geological formations, Dr. Spencer acknowledges the 

 valuable aid which he has had from the previous work of Dr. C. W. 

 Hayes in this territory. The map shows in a very clear and satisfac- 

 tory manner the areal distribution of the formations. We cannot, 

 however, speak so much in praise of the cross sections, in which the 

 vertical scale is so greatly exaggerated as to be quite misleading. 



We consider this the most important of the official documents yet 

 issued by the State of Georgia, and it is to be regretted that during 

 his term of office Dr. Spencer did not have that complete control of 

 the Survey that would have insured the publication of other reports of 

 equal importance, especially one on the Crystalline Schists of the state. 



E. A. Smith. 



Annual Report of the Geological Survey of Arkansas for i8go; 

 J. C. Branner, State Geologist ; Volume IV., Marbles and 

 Other Limestones, by T. C. Hopkins, 8vo., 443 pp., illus- 

 trated by cuts and plates, and accompanied by an atlas con- 

 taining six sheets. 



This volume is the latest of the series of volumes published by the 

 Geological Survey of Arkansas. It is separated into three divisions, 

 which are sub-divided into twenty-eight chapters. The first division is 

 the introductory chapter on the " General Description of the Marble 

 Area." After this comes Part I., which treats of limestones, including 

 the following topics: "Composition and Origin of Limestone," 

 "Varieties of Limestone," "Geologic and Geographic Distribution 

 of Limestones," "Limestone as a Building Stone," "Miscellaneous 

 Uses of Limestone," "The Carboniferous Limestones of North Arkan- 

 sas," "The Silurian Limestones of North Arkansas," "Carboniferous 

 Limestones South of the Boston Mountains," and " The Lime Indus- 

 try of Arkansas." 



Part II. treats of marbles, including the following topics : "The 

 Origin and Uses of Marbles," "Marble in the United States," 

 "Marble in Other Countries," "Marbles of Arkansas," "St. Clair 

 Marble," "The Distribution of the St. Clair Marble," "St. Joe 

 Marble," "Distribution of the St. Joe Marble," "Other Marbles found 

 in Arkansas," " Quarrying, and Cutting, Dressing and Polishing Mar- 

 ble." In addition to this there is an appendix treating of the "Faults 

 of the Marble Area of Northern Arkansas." Like many of the other 



