Authors' Catalogue. 131 
Beede, J. W. 
Descriptions of some new forms Pseudomonotis from the Upper 
Coal Measures of Kansas. (Kans. Univ. Quart., vol. 8, April, 1899, pp. 
79-84.) 
Beyer, Samuel W. 
Report of Air. Samuel W. Beyer. (Iowa Geol. Sur., vol. 9, pp. 
28-29, 1899.) 
Beyer, Samuel W. 
Geology of Story county. (Geol. Sur. Iowa, vol. 9, pp. 155-238. 2 
pis., maps, 1899.) 
Beyer, Samuel W. 
Mineral production of Iowa in 1898. (Geol, Sur. Iowa. vol. 9, pp. 
35-48, 1899.) 
Broadhead, G. C. 
Biographical sketch of George Clinton Swallow. (Am. Geol., vol. 
24. July, 1899, pp. 1-6, portrait.) 
Calvin, Sami el. 
Seventh annual report of the State Geologist [Iowa]. (Iowa Geol. 
Sur.. vol. 9, pp. 11-24, Des jNIoines, 1899.) 
Chalmers. R. 
Report on the surface geology and auriferous deposits of south- 
eastern Quebec. (Part J, Ann. Rept., vol. 10, Geol. Sur. Can., pp. 
160, map, I pi., Ottawa, 189S.) 
Chamberlin, T. C 
Lord Kelvin's address on the age of the earth, as an abode fitted for 
life (II). (Science N. S. 10, 11. July 7, 1899.) 
Davis, A. P. 
Nicaragua and the Isthmian routes. (Nat. Geog. Mag., vol. 10, 
July, 1899. PP- 247-266, 3 pis.) 
Emmoiis, S. F. 
Plutonic Plugs and subtuberant mountains. (Science. N. S., 10, 
24. July 7, 1899. Abstract of paper read before the Geol. Soc. Wash., 
May 10, 1899.) 
Hayes, C. Willard. 
Physiography of the Nicaragua canal route. (Nat. Geog. Mag., 
vol. 10, July, 1899, pp. 233-246. map, 4 pis.) 
Heilprin, Angelo. 
Geology of the Klondike gold fields. (Pop. Sci. Month., vol. LV, 
pp. 300-317, July, 1899.) 
Hershey, O. H. 
Origin and age of certain gold "pocket" deposits in northern Cali- 
fornia. (Am. Geol., vol. 24, pp. 38-43. 1899) 
Hobbs, W H. 
The diamond field of the great lakes. (Jour. Geol., vol. 7, May- 
June. 1899. PP- 375-389) 
