238 Scientific Intelligence. 



combined into nine. The volume also brings out clearly the great 

 development of lime secreted by algae, and the very significant 

 intraformational conglomerates. 



Another very valuable feature of the memoir is the 22 paleo- 

 geographic maps by E. 0. Ulrich (3 Cambrian, 3 Ozarkian, and 16 

 Ordovician) . It is a great question, however, if the Appalachian 

 trough had the three different openings into the Atlantic south 

 of New York here shown. Those who do not accept Ulrich 's 

 views will therefore be obliged to draw very different sea-ways. 



The final half of the volume describes and illustrates 219 spe- 

 cies of fossils, mostly invertebrates, of which but 14 are new (7 

 Cambrian, 5 Ozarkian, and 207 Ordovician). c. s. 



6. Handbuch der Palceogeographie; by Theodor Arldt. 

 Yol. I, Palaeaktologie, Pt. 1, 1917; Pt. 2, 1918 ; Pt. 3, 1919. Pp. 

 679, with 76 small maps. Gebriider Borntraeger, Leipzig. — This 

 is the most comprehensive book treating of the ancient geogra- 

 phies, developed on the basis of the geologic and biologic evi- 

 dence. Nothing appears to be omitted, and all of the more com- 

 prehensive maps are reproduced. The book places paleogeogra- 

 phy on a scientific basis, and is a work of reference that will be 

 of great service to all paleontologists and geobiologists. The sec- 

 ond volume with the index and the necessary pages for binding 

 has not appeared. c. s. 



7. The Geology of East Texas; by E. T. Dumble. Univ. of 

 Texas Bull. No. 1869, 388 pp., 12 pis., 1918 (1920).— This com- 

 prehensive and detailed report brings together all that is known 

 to the author, after many years of geologic work, regarding the 

 formations in eastern Texas that make up the Mesozoic and Ceno- 

 zoic series of rocks. The geologic history begins with the Com- 

 anchian and ends with the Pleistocene. There are chapters on 

 lignite, hydrocarbons, salt and gypsum, iron, clays, and building 

 stone. Dumble has also recently published a very interesting 

 pamphlet treating of the geology of Texas, the result of three lec- 

 tures given at the Eice Institute in Houston under the following 

 titles: (1) The Geology of Texas, its part in the Building of a 

 Continent; (2) The Individaulity of Texas Geology; and (3) The 

 Economic Features of the Geology of Texas. c. s. 



8. Pleistocene Marine Submergence of the Hudson, Champ- 

 lain and St. Lawrence Valleys; by H. L. Fairchild. N. Y. State 

 Mus., Bulls. 209, and 210, 76 pp., 33 pis. and maps, 1919.— This 

 interesting report is doubly instructive because of the many maps 

 that accompany it. It brings together all the knowledge that is 

 of value concerning the invasions of the Atlantic Ocean — widely 

 down the St. Lawrence, narrowly along the Atlantic border, and 

 the Hudson and Connecticut valleys. c. s. 



9. Report of the State Geologist on the Mineral Industries 

 and Geology of Vermont, 1917-1918; by G. H. Perkins et al. 

 Pp. 247, 18 pis., 10 text figs., 1919.— This volume consists of fif- 

 teen different papers treating of the physiography, structure, 

 stratigraphy, Champlain sea-levels, and economic products of 



