BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 13 
Alexander, John S. 
26. The mines of the Altar district, Sonora. — Eng. and Min. Jour., vol. 83, 
pp. 653-654, 2 figs., April 6, 1907. 
Allen, E. T. 
Die Kalkkieselreihe der Minerale. — See Day and others, no. 690. 
Allen, E. T., and White, W. R. 
27. On wollastonite and pseudo-wollastonite, polymorphic forms of calcium 
metasilicate, with optical study by Fred Eugene Wright. — Am. Jour. Sci., 4th 
ser., vol. 21, pp. 89-108, 2 figs., February, 1906. 
Describes experimentation upon wollastonite, natural and artificial, the results ob- 
tained, and their optical characters. 
Allen, E. T., Wright, Fred Eugene, and Clement, J. K. 
28. Minerals of the composition MgSi0 3 ; a case of tetramorphism. — Am. 
Jour. Sci., 4th ser., vol. 22, pp. 385-438, 18 figs., November, 1906. 
Includes a discussion of the formation of meteorites. 
Allorg'e, Maurice. 
29. Esquisse geographique du Cap Cod (Etats-Unis). — Annales de Geog., 
Ann. 15, no. 84, pp. 443-448, 1 pi., 1 fig., November 15, 1906. 
Describes the physiographic features of the region. 
Althouse, Harry W. 
30. The Pocahontas coals, Pottsville series no. XII, in Raleigh and Wyoming 
counties of West Virginia. — Min. Mag., vol. 13, no. 3, pp. 201-213, 7 figs., March, 
1906. 
Describes the geologic horizon, vein structure, thickness, and quality of these coals. 
31. Geology of the Buck Mountain coal bed. — Eng. and Min. Jour., vol. 83, 
pp. 668-670, 2 figs., April 6, 1907. 
32. The so-called new supplies of anthracite [Pennsylvania]. — Eng. and Min. 
Jour., vol. 84, pp. 500-503, 4 figs., September 14, 1907. 
Discusses the occurrence and geologic relations of anthracite coal beds. 
Amador, Manuel G. 
33. Los principales centros auriferos del mundo. Estudio sobre la produc- 
cion actual del oro. — Soc. cient. "Antonio Alzate," Mem. y Rev., t. 23, pp. 355- 
381, 1906. 
Describes the production and general geology of the principal gold-producing areas of 
the world. 
American Society of Civil Engineers. 
34. Report of a general committee and of six special committees of the San 
Francisco Association of members of the American Society of Civil Engineers. 
The effects of the San Francisco earthquake of April 18, 1906, on engineering 
constructions. — Am. Soc. Civil Eng., Proc, vol. 33, no. 3, pp. 299-354, 31 pis., 
3 figs., March, 1907. Discussion by Edwin Duryea, and others, ibid., vol. 33, 
no. 5, pp. 537-547, 1 pi., May, 1907; Trans., vol. 59, pp. 208-329, 1907. 
Ami, Henry M. 
35. On the geology of Carp [ Ontario 1 and environs. — Ottawa Nat, vol. 19, 
no. 4, pp. 92-93, July, 1905. 
36. Bibliography of Canadian geology and paleontology for the year 1904. — 
Canada, Roy. Soc, Proc. and Trans., 2d ser., vol. 11, sect. 4, pp. 127-152, 1906. 
37. Notes on an interesting collection of fossil fruits from Vermont, in the 
Museum of the Geological Survey of Canada. — Ottawa Naturalist, vol. 20, no. 1, 
pp. 15-17, April, 1906. 
