Revietcs — W. J. Harrison — Stonehenge. 275 



starts on the geological work of winds. In the course of his 

 remarks he points out the useful lessons that may be learned from 

 the disc of earth lifted by a falling tree, from the ridge and hollow 

 thereby formed, from the erosion that may result from the exposure 

 of the soil to wind and water, or from the obstruction that may arise 

 to drainage. The tearing up to a depth of four or five inches and 

 scattering of soil in one district, or the formation elsewhere of 

 rugged clifi's of calcareous sandstone by wind-drifted beach deposits 

 made up of fragments of shell and coral, afterwards solidified 

 through the cementation of the particles, are again vividly pour- 

 trayed. Illustrations are also given of the loess in China with its 

 dug-out human habitations. Eeferring to the subject of weathering, 

 and to the minor agent of electricity, mention is made of an irregular 

 train of fulgurites leading off from a tree which was struck by 

 lightning in Florida. The erosive and transporting powers of rivers 

 are dealt with, and the alluvial deposits are traced from their sources 

 in cliff and talus to estuarine deposits and bars. Glaciers, lakes, 

 oceans, and volcanoes receive lucid treatment, and all the subjects 

 are illustrated by diagrams and excellent pictorial views. The 

 illustrations, indeed, are drawn from all parts of the world. 



Structural Geology is dealt with briefly, the definitions being in 

 one or two instances too concise, as when we are told that "Hydraulic 

 limestone is so called because when ground it will ' set ' under 

 water." From a consideration of the minute structure we are led 

 on to contemplate the " gi'oss structure " of rocks — stratification, 

 folds, and faults, veins, bedded ore, placer deposits, and other 

 phenomena. In the chapter on Physiographic Structures various 

 types of mountains are explained, as well as valleys, lake basins, the 

 development of a land surface in youth, maturity, and old age, and 

 the evolution of drainage. 



In the section on Historical Geology the principal formations are 

 briefly described, with especial reference to America, while the 

 fossils are treated, not witli respect to the latest nomenclature, but 

 in a broad, general way: thus, a "Carboniferous Crinoid" or 

 " Jurassic Crustacean " is illusti-ated, while other organisms are 

 generically or specifically designated. Some of the figured fossils are 

 well-known British forms, but the references to physical conditions 

 and economic deposits are essentially American. General questions 

 of correlation are treated in a philosophic spirit, and if we miss 

 any special reference to pala3ontological zones, and to some other 

 topics, we can without hesitation heartily commend this book to the 

 favourable attention of our i-eaders. H. B. W. 



II. — A Bibliography of Stonehenge and Avebury. By W. 

 Jerome Harrison, F.G.S. (Wilts Archceol. and Nat. Hist. Mag., 

 vol. xxxii, December, 1901.) 



THIS is a quarto work of 169 pages containing the titles of 

 947 books, papers, etc., by 732 authors, including 143 who 

 have hidden their identity and appear as " Anon." The author's 

 date from Herodotus, b.c. 450, to Sir Norman Lookyer and Dr. F. C. 



