24 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, [bull. 27 
Blatchford (John). 
1. The Bald Mountain district in the Black Hills. A description o 
the flat formation and some of the ore bodies found in con nee 
tion with it. 
Mines & Minerals, vol. 24, p. 394, 1904. 
Describes the occurrence of gold ore deposits. 
Blatchley (W. S.). 
1. The petroleum industry in Indiana in 1903. 
Ind., Dept. Geol. & Nat. Res., 28th Ann. Rept, pp. 79-209, 2 pis., 3 figs., 1904 
Describes the geologic occurrence of petroleum and natural gas, the geologi 
structure of the oil fields of Indiana, and in detail the production of an< 
exploration for oil by counties. 
2. The lime industry in Indiana. 
Ind., Dept. Geol. & Nat. Res., 28th Ann. Rept., pp. 211-257, 4 pis., 2 figs., 1904 
Bleininger (Albert Victor). 
1. The manufacture of hydraulic cements. 
Ohio Geol. Surv., 4th ser., Bull. no. 3, 391 pp., 81 figs., 1904. 
Includes a discussion of the occurrence and character of clays and other mate 
rials in Ohio suitable for the manufacture of cements. 
Boehmer (Max). 
1. Some practical suggestions concerning the genesis of ore deposits. 
Am. Inst, Mg. Engrs., Trans., vol. 34, pp. 449-453, 1904. 
See no. 94 of the Bibliography for 1903, U. S. Geol. Surv., Bull. no. 240. 
Boggild (O. B.). 
1. Samples of the sea-floor along the coast of east Greenland 74^-7( 
N. L. 
Meddelelser om Gronland, vol. 28, pp. 17-95, 8 pis., 1904. 
Describes the character and origin of the material deposited on the sea botton 
east of Greenland. 
Boright (Sherman H.). 
1. Notes on the geology of the northern portion of the Boisdale Hills 
anticline [Cape Breton Island]. 
Can. Mg. Inst,, Jour., vol. 6, pp. 411-434, ill., 1904. 
Describes the location, geographic and topographic features, the general geol 
ogy, and the character and occurrence of igneous rocks, and Cambrian an( 
Carboniferous strata and economic resources of the region. 
Bose (Emilio). 
1. Informe sobre el origen probable de los temblores de Zanatepec i 
fines de septiembre de 1902, y sobre el estado actual del volcar 
de Tacana. 
Mexico, Secretaria de Fomento, 2 a ep., afio 3, no. 5, IV, pp. 59-79, 1903. 
Mexico, Inst. Geo!., Par., t. 1, pp. 5-25, 4 pis., 1903. 
Discusses the probable origin of the earthquakes of Zanatepec of September. 
1902, and the present condition of the volcano of Tacana. 
