rEEKs.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1904. 59 
hwillim (J. C). 
Notes on some western coals. 
Can. Mg. Inst., Jour., vol. 7. Advance separate, 3 pp., 1904. 
Gives observations upon the occurrence and character of coals in Alberta and 
British Columbia, and their geologic horizons. 
H. 
tlaanel (Eugene). 
I. Discussion of Mr. W. M. Brewer's paper on "The rock-slide :il 
Frank, Alberta Territory, Canada." 
Inst. Mg. Engrs., Trans., vol. 26, pp. 157-163, 1904. 
See no. 125 of U. S. Geol. Surv., Bull. no. 240. 
Saas (Hippolvt). 
.. Der Vulkan. Die Natur und das Wesen der Feuerberge im Lichte 
der neueren Anschauungen fur die Gebildeten aller Stande in 
gemeinfasslicher Weise dargestellt. 
Berlin, Alfred Schall. 340 pp., 32 pis., [1904]. 
A general discussion of volcanic activity, its causes, nature, etc. One chapter 
is devoted to volcanic eruptions in the Lesser Antilles in 1902. 
Haehl (H. L.) and Arnold (Ralph). 
II. The Miocene diabase of the Santa Cruz Mountains in San Mateo 
County, California. 
Am. Phil. Soc, Proc, vol. 43, pp. 16-53, 27 figs., 1904. 
Describes character and occurrence of Tertiary formations and included igneous 
rocks, and the petrographic characters of the latter. Includes lists of fossils 
contained in the Tertiary formations. 
Hager (Lee). 
If.. The mounds of the southern oil fields. 
Eng. & Mg. Jour., vol. 78, pp. 137-139, 180-182, 4 figs., 1904. 
Describes the general geology of the Gulf coastal region of Louisiana and 
Texas, and the geologic structure of the mounds and salines, discusses the 
theories of their origin, and presents a new hypothesis. 
Hall (Benjamin M.).' 
It. Water powers of Alabama, with an appendix on stream measure- 
ments in Mississippi. 
II. S. Geol. Surv., Water-Supply and Irrigation Paper no. 107, 253 pp., 9 pis., 
(9 figs., 1904. 
Includes a brief account of the topographic and geologic features of the state. 
Hall (Charles E.). 
L. Notes on a geological section from Iguala to San Miguel Totolapa. 
State of Guerrero, Mexico. 
Soc. Cient. Ant. Alzate, Mem. y Rev., t. 13, pp. 327-335, 2 pis. (sections), 
1903. 
Describes character and occurrence of Tertiary and Cretaceous strata and of 
igneous rocks, and gives several sections showing the geologic relations of 
these formations. 
