weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1901. 
219 Davis (William M.). Current notes on physiography. 
Science, new ser., vol. 14, pp. 537-538, 1901. 
Contains remarks on glacial lakes in Minnesota, esker lakes in Indi- 
ana and the Ontario coast. 
220 Current notes on physiography. 
Science, new ser., vol. 14, pp. 698-699, 1901. 
Refers to dikes as topographic features, the character of the plain of 
St. Lawrence Valley and the question of peneplains. 
221 Current notes on physiography. 
Science, new ser., vol. 14, pp. 778-779, IDOL 
Reviews papers by Johnson on the High Plains and by how on the 
south "shore of Hudson Strait. 
222 Current notes on physiography. 
Science, new ser., vol. 14, pp. 856-851), 1901. 
Reviews Hobbs's paper on the River system of Connecticut and Dowl- 
ing and Tyrrell on Lake Winnipeg. 
223 Dawson (George M.). Summary report on the operations of the 
Geological Survey for the year 1898. 
Can. Geol. Surv., new ser., vol. 11, Kept. A, 208, pp.. 1901, published 
in 1899. 
224 Geological record of the Rocky Mountain region j n Canada. 
Geol. Soc. Am., Bull., vol. 12, pp. 57-02. 1901. 
Gives an account of the physiographic features and a tableof geologic 
formations of the region. Describes the character and occurrence of 
the rocks of the subdivisions of the Archean, Paleozoic, Mesozoic, and 
Cenozoic eras. 
225 Physical history of the Kooky Mountain region in Canada. 
Science, new ser., vol. 13, pp. 401-407, 1901. 
Contains portion of address delivered before the Geological Society of 
America. 
226 Day (David T.). Notes on the occurence of platinum in North 
America. 
Am. Inst. Mg. Engrs., Trans, vol. 30, pp. 702-708, 1001. 
Describes the geographic distribution of platinum and its occurrence 
on the Pacific Coast. 
227 Dean (Bashford). On two new A rth rod ires from the Cleveland 
shale of Ohio. 
N. Y. Acad. Sci., Mem., vol. 2, pp. 86-100, pis. 2-7. figs. L-2, 1901. 
228 On the characters of Mylostonia Newberry. 
N. Y. Acad. Sci., Mem., vol. 2, pp. L01 109, pis. 7 8, figs. 3 10, L901. 
229 Further notes on the relationships of* the Arthrognathi. 
X. Y. Acad. Sci., Mem., vol. 2, pp. 110 L23, figs. L2 18, L901. 
Discusses the position of the Arthrognathi and the systematic am 
ment and nomenclature of the structures. 
9251— No. 203—02 3 
