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mon. In texture they vary from close grained, compact and granular to coarsely crystalline.

In spite of the large quantity and good quality of much of this marble, very little of it has been utilized and practically none of it has been shipped for outside consumption. The country is only very sparsely settled, and this fact doubtless accounts for the limited local use of the marble; while the lack of shipments to outside localities is explained by the want of transportation facilities, the ignorance of the existence of this marble among those who use such materials, and by the fact that many people have obtained a bad impression of the stone in general on account of a certain very poor grade of Arkansas marble used in building at Eureka Springs. The whole marble region is destitute of railroads, except at Batesville on the eastern end, and Eureka Springs on the western end, so that the use of a poor grade of this marble at a much visited locality like the latter place, was an unfortunate occurrence. The present volume will, therefore, do much good in removing these several difficulties. It will show some of the benefits to be derived by those who will introduce railroads into this country, which, indeed, is full of other resources besides its marble; it will bring the marble to the attention of builders and architects and all others interested in ornamental and structural materials; and it will also tend to overcome the bad impression given by the use of an inferior marble at Eureka Springs. Even without further railway facilities, the marble, as shown by Mr. Hopkins, could be cheaply shipped by water on the White River.

The chapter on "Carboniferous Limestones South of the Boston Mountains," is by Mr. J. H. Means, and is a careful discussion of the subject involved.

In conclusion, it may be said that the volume, besides containing a full discussion of the subject of marbles and other limestones, also gives much information on the geology of North Arkansas, and represents a large amount of careful geological work. The report is of much scientific and economic value, and reflects great credit on both Mr. Hopkins, through whose labors the great amount of work represented in the volume and the accompanying maps has been accomplished, and on the State Geologist, Dr. Branner, by whose liberal and broad minded policy, as well as by whose kindly interest in all investigations carried on under his supervision, such work is possible.