98 BIBLIOGEAPHY OF NORTH AMERICAN GEOLOGY, 1906-190*7. . 
Hobbs, William Herbert, and Leith, Charles Kenneth. 
1193. The pre-Canibrian volcanic and intrusive rocks of the Fox River Val- 
ley, Wisconsin. — Univ. of Wisconsin, Bull. no. 158, Science Series, vol. 3, no. 6, 
pp. 247-277, 1 pi., 21 figs., May, 1907. 
Hobson, Bernard. 
1194. A new geological map of North America. — Geol. Mag., dec. 5, vol. 3, 
no. 12, pp. 564-566, December, 1906. 
1195. An excursion to the volcanoes of Navado de Toluca and Jorullo in 
Mexico. — Geol. Mag., dec. 5, vol. 4, no. 1, pp. 5-13, 1 pi.. January. 1907. 
Describes physical, geologic, and petrologic features of these volcanoes. 
1196. The volcanoes of Mexico. — Scottish Geog. Mag., vol. 23, pp. 25-27, 
1907. 
Plant remains in basalt, Mexico. — See Solorzano and Hobson, no. 2257. 
Hoffmann, G. Christian. 
1197. [Report on] chemistry and mineralogy. — Canada, Geol. Survey, Summ. 
Rept. for 1905, pp. 125-131. 1906. 
(Jives a brief account of the work done by the division of chemistry and mineralogy 
of the Geological Survey of Canada and an annotated list of minerals and rocks added 
to its museum. 
1198. Report of the section of chemistry and mineralogy. — Geol. Survey of 
Canada. Ottawa, 1906. 71 pp. 
Includes notes on the occurrence and composition of various minerals and economic 
materials. 
Hogbom, A. G. 
1199. Zur Petrographie der kieinen Antillen. — Geol. Inst. Univ. Upsala, 
Bull., vol. 6, no. 11-12, pp. 214-233, 2 pis., 1905. 
Describes rocks collected from various islands of the Lesser Antilles. 
Holden, R. J. 
1200. The brown ores of the New River-Cripple Creek district, Virginia. — 
U. S. Geol. Survey, Bull. no. 285, pp. 190-193, J906. 
Describes the geologic structure of the district and the occurrence, character, and 
origin of the iron ores. 
1201. Mineral resources of Virginia : Iron. — In Watson, T. L., Mineral re- 
sources of Virginia, pp. 402—491, 8 pis., 20 figs., 1907. 
Holland, W. J. 
1202: The osteology of Diplodocus Marsh, with special reference to the 
restoration of the skeleton of Diplodocus carnegiei Hatcher, presented by .Mr. 
Andrew Carnegie to the British Museum, May 12, 1905. — Carnegie Mus., Mem., 
vol. 2, pp. 225-278. 8 pis., 30 figs., 1906. 
Hollick, Arthur. 
1203. The Cretaceous flora of southern New York and New England. — U. S. 
Geol. Survey, Mon., vol. 50, 219 pp., 40 pis., 1906. 
Reviews the progress of geologic investigation upon the Cretaceous of the region and 
describes the general character and correlation of the plant-bearing beds and gives sys- 
tematic descriptions of the plant remains. 
1204. Origin of the amber found on Staten Island.— New York Bot. Garden, 
vol. 7, pp. 11-12, 1906. 
1205. A newly discovered outcrop of Triassic rock on Staten Island [New 
York].— Staten Island Assoc. Arts and Sciences, vol. 1, pt. 1, pp. 16-17, 1906, 
Describes the character and occurrence of Triassic rocks in Staten Island. 
