Authors' Catalogue. 193 
Elftman, A. H. 
The geology of the Keweenawan area in northeastern Minnesota. 
<Am. Geol., vol. 21, pp. 90-109, pi. 11, Feb. 1898.) 
Ells, R. W. 
Formations, faults and folds of the Ottawa district. (Ottawa Nat- 
uralist, vol. 9, pp. 177-189, Jan, 1898.) 
Ells, R. W. 
Recent conclusions in Quebec geologv. (Ottawa Naturalist, vol. 
II, pp. 173-176, Dec. 1897.) 
Gilbert, G. K. 
A proposed addition to physiographic nomenclature. (Science, new 
ser., vol. 7, pp. 94-95, Jan. 21, 1898.) 
Gilpin, E., Jr. 
Some analyses of Nova Scotia coals and other minerals. (Trans. 
Nova Scotian Inst. Sci.. vol. 9 l2nd ser., vol. 2], pt. 3, pp. 246-254, 
Nov. 30, 1897.) 
Gresley, W. S. 
Clay-veins vertically intersecting Coal Measures. (Geol. Soc. Amer., 
Bull., vol. 9, pp. 35-58, Jan. 18, 1898.) 
Kemp, J. F. 
The Montreal meeting of the Geological Society of America. (Sci- 
ence, new sen, vol. 7, pp. 48-53, Jan. 14, 1898; pp. 79-85, Jan. 21, 1898.) 
Kummel, H. B. 
The age of the artifact-bearing sand at Trenton. (Science, new ser., 
vol. 7, pp. 1 15-117, Jan. 28, 1898.) 
IVIarbul, C. F. 
Cote Sans Dessein and Grand Tower. (Am. Geol, vol. 21, pp. 86-90, 
pi. 10, Feb. 1898.) 
Orton, Edward. 
Geological probabilities as to petroleum. President's address. (Geol. 
Soc. Amer., Bull., vol. 9, pp. 85-100, Jan, 24, 1898.) 
Pratt, J. H. 
Mineralogical notes on cyanite, zircon, and anorthite from North 
Carolina. (Am. Jour. Sci., ser. 4, vol. 5, pp. 126-128, Feb. 1898.) 
Prosser, C- S. 
The Permian and Upper Carboniferous of southern Kansas. (Kans. 
Univ. Quart., vol. 6, pp. I49-I75, pls. 18-19, Oct. 1897.) 
Roy, Andrew. 
Geology of the Jackson County coal in Ohio. (Eng. and Min. 
Jour., vol. 65, p. 164, Feb. 5, 1898.) 
Ruedemann, R. 
Synopsis of recent progress in the study of graptolites. (Am. Nat., 
vol. 32, pp. i-x6, Jan. 1898.) 
