Authors' Catalogue. 325 
Calvin, S. 
Iowa Geological Survey, volume 10; annual report, 1899, with ac- 
companying papers, pp. 666. Ten maps, 102 figures. Des Moines. 
1900.) 
j Edward Drinker Cope.] 
Addresses by Theo. Gill, H. F. Osborn and Wm. B. Scott. 
(Proc. Am. Phil. Soc. Phil.; memorial volume I, pp. 273-314. 1900.) 
Crawford J. 
Dr. Angelo Heilprin and the decrease of water in lake Nicaragua. 
{Am. GeoL, vol. 26, p. 257, Oct., 1900.) 
Davis, C. A. 
A contribution to the natural history of marl. (Jour. Geo!., vol. 
.S, pp. 485-497, Sept.-Oct., 1900.) 
■ Davis, C .A. 
A remarkable marl lake. (Jour. GeoL, vol. 8, pp. 498-503, Sept.- 
Oct., 1900.) 
Davis, W. M. 
Notes on the Colorado canyon district. (Am. Jour. Sci.. vol. 10, 
pp. 251-259, Oct., 1900.) 
Douglas, James 
Obituary notice of Thomas Sterry Hunt. (Proc. Am. Phil. Soc, 
Phil.; memorial volume, I., pp. 63-123, 1900.) 
Gill, Theodore 
Herpetological and ichthyological contributions [of E. D. Cope]. 
(Proc. Am. Phil. Soc, Phil.; memorial volume, I, pp. 274-296, 1900.) 
Grant, U. S. (N. H. Winchell andi 
Petrographic geology of the crystalline rocks of Minnesota. 
(Final Rep. Geol. Nat. Hist. Sur. Minn., vol. 5, pp. 75-936, 1900.) 
Hoilick, Arthur. 
Some features of tlie drift on Staten island. (Ann. N. Y. Acad. 
Sci., vol. XII, pp. 91-102, July 7, 1899.) 
Hopkins. T. C 
Cambro-Silurian hmonite ores of Pennsylvania. (Bull. G. S. A,, 
vol. II, pp. 475-502, pi. 50. July, 1900.) 
Irving, J. D. 
.\ contribution to the geology of the northern Black Hills. (Ann. 
N. Y. Acad. Sci., vol. 12, pp. 187-340, Dec. 18, 1899.) 
Lee, W. T. 
The origin of the debris-covered mesas of Boulder, Colorado. 
(Jour. GeoL, vol. 8, pp. 504-511, Sept.-Oct.. 1900.) 
Macbride, T. H. 
Geology of Osceola and Dickinson counties. (Geol. Sur. Iowa, 
vol. ID, pp. 185-239, 1900.) 
Merrill, F.J. H. 
. Origin of the white and variegated clays of the north shore of 
Long island. (\y\v\. N. Y. -\cad. Sci., vol. 12. pp. 113-116, July 8. 
11899.) 
