BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 77 
Freeh, Fritz — Continued. 
901. Ueber Aviculiden von paheozoischem Habitus a us der Trias von Zacate- 
cas.— Congr. geol. intern., C. R. 10° sess., Mexico, 1906, pp. 327-340, 2 pis., 1907. 
Discusses climatic conditions prevailing during the Triassic, and describes Aviculidse 
from the Triassic deposits of Zacatecas, Mexico. 
Frost, Max, and Walter, Paul A. F. 
902. [Physiography and geology of New Mexico.] — In "The Land of Sun- 
shine," published by the New Mexico Bureau of Immigration, Santa Fe, N. M., 
pp. 23-30, 11 pis., 1006. 
Gives a general account of the physiographic features and general geology of New 
Mexico. 
Fuller, Myron L. 
903. Work of the eastern section of hydrology [of the United States Geo- 
logical Survey] in 1905, and publications relating to underground waters.—* 
U. S. Geol. Survey, W.-S. and Irrig. Paper no. 160, pp. 1-8, 1906. 
904. Significance of the term " artesian." — U. S. Geol. Survey, W.-S. and 
Irrig. Paper no. 160, pp. 9-15, 2 tigs., 1906. 
Discusses the various ways in which the term " artesian " has been used and gives 
definitions. 
905. Representation of wells and springs on maps. — U. S. Geol. Survey, 
W.-S. and Irrig. Paper no. 160, pp. 16-18, 1906. 
Froposes a system of symbols for representing on maps wells and springs of different 
character. 
906. Total amount of free water in the earth's crust. — U. S. Geol. Survey, 
W.-S. and Irrig. Paper no. 100, pp. 59-72, 1906. 
907. Peculiar mineral waters from crystalline rocks of Georgia. — U. S. 
Geol. Survey, W.-S. and Irrig. Paper no. 100, pp. 86-01, 1906. 
Describes the composition of the waters and discusses the geologic conditions and the 
sources of their mineralization. 
908. Instances of improvement of water in wells. — U. S. Geol. Survey, 
W.-S. and Irrig. Paper no. 1(50, pp. 96-99, 1906. 
909. Comparative intensities of the New Madrid, Charleston, and San Fran- 
cisco earthquakes. — Abstract : Science, new ser., vol. 23, pp. C17-918, June 15, 
1906. 
910. Our greatest earthquakes. — Pop. Sci. Monthly, vol. 69, no. 1, pp. 76- 
86, 6 figs., July, 1000. 
Gives an account of the New Madrid. Mo., earthquake, and compares the New Madrid, 
Charleston, and San Francisco earthquakes. 
911. Underground water investigations in the United States. — Econ. Geology, 
vol. 1, no. 6, pp. 554-569, 1906. 
Describes the development of hydrologic investigations in the United States, the char- 
acter of hydrologic problems and methods of investigation, and the problems awaiting 
study. 
912. Clays of Cape Cod, Massachusetts. — U. S. Geol. Survey. Bull. no. 285, 
pp. 432-441, 1906. 
Describes the general geology, and the occurrence, character, and structure of the clay 
beds. Includes a geologic section of the Cape Cod region. 
913. Glacial stages in southeastern New England and vicinity.— Science, new 
ser., vol. 24, pp. 467-469, October 12, L906. 
914. The elevated beaches of Labrador.— Abstract : Science, new ser., vol. 25, 
p. 32, January 4, 1907, 
