1880. ] Recent Literature. 885 
book, the author has availed himself of the criticisms of other 
naturalists, and thus made a considerable number of changes in 
the stereotype plates. Several of the figures, notably that illus- 
trating the anatomy of the cat, have been changed, and one of the 
opossum and its marsupial bone added. Other changes have 
been made in order to bring the book up to the present state of 
the science. 
DavuBREE’s CHEMICAL GeEoLocyY.!— This grand work may be 
regarded as a revised collected edition of the former smaller 
successful scientific life, and on it he may safely rest his fame. 
The first section of the work deals with chemical and physical 
phenomena—metalliferous deposits, nature of metamorphism, the 
effect of heated waters, formation of zeolites, amygdaloids, rocks 
both eruptive and metamorphic, and volcani¢ action. 
The second section treats of mechanical phenomena, and applies 
the rigid experimental method of trituration and transportation of 
sediments, and chemical decompositions by mechanical forces ; the 
distriffution of gold in the bed of the Rhine is also discussed. The 
first chapter contains an account of the experiments on the stria- 
tion of rocks. The marks or striz are. produced or imitated by 
rubbing pebbles together. The second chapter treats of the 
deformations which the earth’s crust has been subjected to in for- 
mer ways. Sir James Hall’s experiments were of a similar char- 
acter. The remarkable examples of reversed folds, as shown in 
the Alpine regions, are imitated and explained, The discussion 
of the nature and causes of faults, joints and all kinds of frac- 
tures in sedimentary rocks will be read by the geologist with 
peculiar interest. The account of the experiments on the 
developed by the crushing, grinding and mutual frictions of rocks 
are important; it is believed that sufficient heat may be generated 
in this way to produce metamorphism 
The second part treats altogether ‘of cosmic bodies. Three 
hundred and fifty pages are devoted to the experimental study of 
the structure and genesis of meteorites and the accompanying 
minerals. The entire volume is well illustrated, and as a speci- 
men of typography may be regarded as a model of clearness and 
beauty.—F. V. Y. 
Hertwic’s CuztocnatH Worms2—A careful elaboration a 
the morphology and development of the Sagitta, the type of 
Chætognathi, that singular type of worms, so aberrant that it bias 
1 Etudes tae vrai a Geologie Experimentale. Par A. Daubrée. Premiere par- 
o Appli n de la méthode experimentale a l'etude de divers phenoménes geol- 
ogiques, Deus uxieme etary eet ht de la pow _ ceprctnpsiele a etude de 
divers phenoménes cosmologiques. Large 8v o, 828 pa 
? Die Chatognathen. Ihre Anatomie, pipet mis 'Entvictlangeschichte. moe 
Monographie. Von Dr. Oscar Hertwic. Mit 6 Tafeln. Jena, 1880. 
