1899] EXPERIMENT IN GEOLOGY 299 



geological gallery of the Jardin des Plantes in Paris. The book thus provides 

 an agreeable guide to this collection. 



There is much in it that will be of service to the teacher of ordinary classes, 

 such as the reproduction of earth-pyramids, described on p. 40, and of sand- 

 dunes, described on p. 210; while the broad and at times generous deductions 

 from the experiments deserve the attention of the physical geographer as well 

 as the geologist. The discussion (pp. 107-111) of the continuous diminution of 

 glaciers by the continuous erosion of their gathering-grounds and of their beds, 

 is an example of how the larger natural features are always present to the 

 mind of the experimenter. 



The book is brief ; yet there is frequent mention of the work of other 

 authors. It is impossible, in such limits, however, that such reviews of 

 previous observations should be complete. As an expression of Mr. Stanislas 

 Meunier's own work and of his own conclusions, the volume is especially profit- 

 able to the reader. Towards its close, we touch on the great questions of 

 igneous magmas and metamorphism, which are now agitating the geological 

 world. We commend the bold suggestion made on p. 266, to those who regard 

 the solution of one rock in another as confined to contact-phenomena. The 

 author here derives the water required for volcanic action from the absorption 

 of blocks of the water-logged outer layers of the crust by the molten and 

 anhydrous mass below. G. A. J. C. 



We have received Naturae Novitates for 1898, that useful fortnightly 

 bibliographic bulletin of natural science issued by Messrs. Friedlander of Berlin. 

 The collected parts for 1898 amount to 780 pages, the index occupies about 90, 

 the number of citations is 9359, and the price is only four marks. It is now in 

 its twenty-first year of issue, and deserves to be congratulated on attaining its 

 majority. 



In the September number of The Naturalist there are obituary notices of 

 Mr. John Cordeaux by W. Eagle Clarke and the Rev. E. A. Woodruffe-Peacock. 

 A note by E. Whitehouse points out that Hydra viridis devours Aphides 

 greedily. " The Hydra would thus be very serviceable in a greenhouse if they 

 could live on plants." 



The Zoologist for August 15 contains an obituary and portrait of the late 

 Sir William Henry Flower, and a continuation of Mr. W. L. Distant's lively 

 paper on mimicry. 



Knowledge for August contains a continuation of the anthropological studies 

 by Prof. Arthur Thomson of Oxford, and the tenth instalment of Mr. 

 Stebbing's " Karkinokosm," which reads like a novel. A striking photograph of 

 proboscis and snub-nosed monkeys illustrates a lively paper by Mr. Lydekker, 

 entitled "A Contrast in Noses." 



The American Naturalist for August contains articles on the Hopkins 

 Seaside Laboratory, by Prof. Vernon L. Kellogg (see " Notes and Comments ") ; 

 on the North American arboreal squirrels, by Mr J. A. Allen ; and on an abnormal 

 wave in Lake Erie, by Mr. Howard S. Reed. There is also an obituary of Dr. 

 Alvin Wentworth Chapman, by Prof. W. Trelease, and a synopsis of North 

 American Gordiacea, by Dr. Thomas H. Montgomery, jun. 



Knowledge for September contains, inter alia, a fifth paper on the Mycetozoa, 

 by Sir Edward Fry ; a popular essay on Fairy Rings, by Mr. A. B. Steele ; the 

 beginning of an account of Ben Nevis and its Observatory, by Mr. W. S. Bruce ; 

 a paper on Clouds (with good photographs), by Messrs. E. M. Antoniadi and G. 

 Mathieu ; and a letter by Dr. C. S. Patterson adversely criticising some of the 

 conclusions in Prof. MTntosh's "Resources of the Sea." 



