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 Zhe 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 8. 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. 8. Bruce ; 
a paper on Clouds (with good photographs), by Messrs. E. M. Antoniadi and G. 
Mathieu ; and a letter by Dr. C. 8. Patterson adversely criticising some of the 
conclusions in Prof. M‘Intosh’s ‘‘ Resources of the Sea.” 
