266 Notices of Memoirs. 



shale ; and is chiefly stored in the former. Professor Clay pole 

 states that the anticlinal theory explained by Professor I. C. White 

 in Pennsylvania holds good for California. — T. E. J. 



II. — Maryland Geological Survey : Alleghany County. 

 (Baltimore, 1900, pp. 323.) —William Bullock Clarke and his 

 staff have produced one of those interesting volumes v^e are so 

 accustomed to see from the United States, and which are so well 

 printed in comparison with those published by our own Government. 

 The Physiography, by Cleveland Abbe, is illustrated by a photograph 

 of a model of the county, from which the student can see at a glance 

 the general features of the land, and thus clearly follow the descrip- 

 tions of the author. Next comes the Geology, by C. C. O'Harra. 

 This includes Silurian to Permian beds overlain by alluvial and 

 other late deposits. The Minerals, Soils, Climate, Hydrography, 

 Magnetics, Forests, Flora, and Fauna are all treated of in detail. 

 The whole is illustrated in the usual manner by excellent repro- 

 ductions from photographs, and a bibliography of 175 items is 

 furnished. Among the maps provided are, one showing the wooded 

 areas, another showing the magnetic declination, and a third showing 

 structural sections. These latter are geological sections across the 

 county at regular intervals, and give the reader a better idea of the 

 features than pages of descriptive writing. A good index completes 

 the volume. 



III. — The Carboniferous System in Eastern Canada. — 

 Dr. H. M. Ami writes in the Trans. Nova Scotia Inst. Sci., vol. x, 

 on the subdivisions of the Carboniferous system in Eastern Canada, 

 with special reference to the position of the Union and Eiversdale 

 formations of Nova Scotia, referred to the Devonian system by 

 some Canadian geologists. He discusses the evidence afforded 

 from a study of plant and animal life, and of the marine sediments. 

 He has come to the conclusion that the two formations mentioned 

 above belong properly to the earliest times of the Carboniferous, 

 and proposes to include them in that system under the name of 

 Eo-Carboniferous. Dr. Ami seems to have taken a good deal of trouble 

 in arriving at his conclusions, and has submitted collections of the 

 fauna and flora to certain specialists so as to get independent opinion 

 as to their several ages. 



IV. — Edinburgh Geological Society. (Transactions, 1901, 

 vol. viii, pt. 1.) — Petrology is to the fore in this part. Kynaston 

 has a paper on contact metamorphism round the Cheviot Granite, 

 and writes on Tuffs associated with the Andesite Lavas of Lome. 

 Mackie gives seventy analyses of rocks chiefly from the Moray area, 

 and has a paper on differences in chemical composition between the 

 central and marginal zones of granite veins, with further evidences 

 of exchanges between such veins and the contact rocks. Hinxman 

 describes spherulitic felsite from Glen Feshie. Stratigraphy is 

 handled by Goodchild, who deals with recent exposures of rock in 

 Edinburgh, one section being under the site of the new offices of 



