weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1898. 37 
231 De Kalb (Courteiiay). The onyx marbles. 
Stone, vol. xvii, pp. 397-405, 1898. 
Describes the occurrence of onyx marbles. 
232 See Parker (E. W.), No. 598. 
233 Derby (Orville A.). On the origin of certain siliceous rocks. 
Jour, of Geol., vol vi, 366-368, 1898. 
Discusses the origin of the Arkansas novaculite. 
234 Diller (Joseph Silas). The educational series of rock specimens 
collected and distributed by the United States Geological 
Survey. 
U. S. Geol. Surv., Bull. No. 150, 400 pp., pis. i-xlvii, figs. 1-18, 1898. 
Describes the structural and physical features of rocks, the principal 
rock-making minerals, and the classification of rocks, with descriptions 
and chemical analyses of the educational series of rocks distributed by 
the U.S. Geological Survey. 
235 Roseburg folio, Oregon. 
U. S. Geol. Surv., Geol. Atlas of U. S., Folio No. 49, 1898. 
Describes the topography, the occurrence of the Juratrias ( ? ), Cre- 
taceous, Tertiary, and igneous rocks, and the occurrence of gold, coal, 
cement, and building stone. Discusses the origin of the topography. 
Includes topographic and geologic maps. 
236 D'Invilliers (E. V.). 
Franklin Inst., Jour., vol. cxlvi, pp. 41-42, 1898. 
[In discussion of paper by R. Cabrera on " Mineral resources of 
Cuba."] 
237 Douglas (James). The copper industry of Arizona. 
The Mineral Industry 1897, pp. 227-232, 1898. 
Describes the occurrence of copper in the mines of Arizona. 
238 Douville (M. H.). Sur les couches a rudistes du Texas! 
Soc. G6ol. de France, Bull., vol. xxvi, pp. 387-388, 1898. 
Discusses the paleontologic evidence of the age of certain subdivisions 
of the Cretaceous of Texas. 
239 Drake (Noah Fields). A geological reconnaisance of the coal fields 
of the Indian Territory. 
Am. Phil. Soc, Proc, vol. xxxvi, pp. 226-419, pis. i-ix, 6 figs., 1897. 
Leland Stanford Univ., Pub., Cont. to Biology, xiv, pp. 226-419, pis. i-ix, 
6 figs., 1898; Review by C. R. Keyes, Jour, of Geol., vol. vi, pp. 652-658, 
1898. 
Describes the character, occurrence, distribution, and classification 
of the Coal Measures and the occurrence and character of the coals, and 
gives lists of fossils collected and description of three new species. 
240 Drygalski (Erich von). Gronlands Eis und sein Vorland. 
Gronland-expedition der Gesellschaft fiir Erdkunde zu Berlin, Erster 
baud, 556 pp., 41 pis., 54 figs, and 9 maps, 1897. 
Describes the physiographic features and glacial phenomena of por- 
tions of Greenland. 
