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REVIEWS.
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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 satisfactory 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 1890; J. C. Branner, State Geologist; Volume IV., Marbles and Other Limestones, by T. C. Hopkins, 8vo., 443 pp., illustrated by cuts and plates, and accompanied by an atlas containing 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 Arkansas," "The Silurian Limestones of North Arkansas," "Carboniferous Limestones South of the Boston Mountains," and "The Lime Industry 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 Marble." In addition to this there is an appendix treating of the "Faults of the Marble Area of Northern Arkansas." Like many of the other

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