Geology. 355 



O'CoNNELL. Bull. Amer. Mus. Nat. Hist., vol. 42, pp. 643-692, 

 pis. 34-38, 8 text figs., 1920. — In this paper are described at great 

 length seven forms of ammonites (four are new) of the genera 

 Perisphinctes, Ochetoceras, and Ataxioceras, from the Upper 

 Oxfordian of western Cuba. c. s. 



4. A Text-hook of Geology; by Amadeus W. Grabau. Part 

 I, General Geology, pp. 864, text figs. 1-734; Part II, Historical 

 Geology, pp. 976, text figs. 735-1980. Boston (D. C. Heath & 

 Co.), 1921. — This is a large two-volume work of 1840 pages, over 

 90 of which are in the two indexes. It is not provincial either in 

 spirit or in scope, but is probably too comprehensive for under- 

 graduates in geology; all geologists and postgraduate students 

 in this science will, however, want to use the book. The text is 

 often discursive, but reads easily, and, as is to be expected of the 

 author, bristles with unusual terms and with original interpre- 

 tations. It is loaded with illustrations, many of them original, 

 but the majority taken directly from many sources and done in 

 all styles of reproduction, with the consequence that the appear- 

 ance of the volumes is not as good as might be desired. It is 

 unfortunate that the pagination does not run continuously 

 through the two volumes, as do the chapter numbers and the 

 figures. 



The subject matter of the twenty-three chapters of Part I is 

 arranged as in no other book. The earth is first viewed as a 

 whole ; then the subdivisions of geology are discussed ; followed 

 by the rise of geologic observations and interpretations; the 

 literature ; materials of the earth 's crust ; classification of rocks ; 

 igneous and volcanic phenomena; the water-laid strata; the 

 organic rocks, with a great mass of detail about the organisms 

 precipitating lime; the work of ice; destruction, transporta- 

 tion and consolidation of rocks; and finally deformation, meta- 

 morphism, and erosion forms. 



Part II begins with the units and history of classification, fol- 

 lowed by mapping and correlation ; the uses of fossils ; classifica- 

 tion and morphology of plants and animals (over 100 pages) ; 

 and then by twenty-one chapters on the geologic history of the 

 earth and its inhabitants, done in the usual way, with the addi- 

 tion of a discussion of the life of each era from the viewpoint of 

 evolution. The book abounds in paleogeographic maps, many of 

 which are decidedly original, with highly hypothetic and deeply 

 embayed shore-lines ; the lands are drawn as drowned, in conse- 

 quence of which the drainage flows into the heads of deep bays, 

 and not into projecting deltas as is so common at present. 



5. Het Idjen-Hoogland. Monographie II. De Geologie en 

 Geomorphologie van den Idjen, door Dr. G. L. L. Kemmerling. 

 Batavia (no date). 4to, 162 pages with LVIII plates and a 

 folded geological map, 1 :250,000, — The Idjen highland consists 



