weeks] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1898. 39 
251 Elftman (A. H.). The St. Croix River Valley [Minnesota- Wis- 
consin]. 
Am. Geol., vol. xxii, pp. 58-61, 1898. 
Describes the relation of the preglacial and postglacial courses of 
the river. 
252 Ellis (W. Hodgson) and Lawson (William). Chemical notes on 
the so-called Sudbury coal [Ontario]. 
Can. Inst., Proc, new ser., vol. i, pp. 67-68, 1897. 
Gives chemical analyses of the coals. 
253 Ells (R. W.). Notes on the Arohean of eastern Canada. 
Can. Roy. Soc, Proc. and Trans., 2d ser., vol. iii, sect, iv, pp. 117-124, 
1898. 
Describes the occurrence and general character of the Laurentian 
and Huronian rocks. 
254 Sands and clays of the Ottawa Basin [Canada]. 
Geol. Soc. Am., Bull., vol. ix, pp. 211-222, pi. 16; Abstracts, Jour, of 
Geol., vol. vi, pp. 117-118 ; Science, new ser., vol. vii, pp. 49-50 (£ p. ), 1898. 
Describes the physiography of the region, the character and distri- 
bution of the sands and clays and other glacial phenomena. 
255 Problems in Quebec geology. 
Brit. Assoc. Adv. Sci., Rept. 1897, pp. 640-642, 1898; Abstract, Ottawa 
Nat., vol. xi, pp. 173-176, 1897. 
Describes the general results of the study of the geology of the Prov- 
ince. 
256 Formations, faults, and folds of the Ottawa district [Canada]. 
Ottawa Nat., vol. xi, pp. 177-189, 1898. 
Describes the occurrence, character, and structure of the Ordovician 
strata of the vicinity. 
257 Emerson (B. K.). Geology: Turner Falls region. Two excursions 
in the Connecticut Valley [Massachusetts). 
Am. Assoc. Adv. Sci., fiftieth anniversary meeting. Guide to locali- 
ties illustrating the geology, marine zoology, and botany of tue vicinity 
of Boston. Edited by A. \V. Grabau and J. E. Woodman, pp. 33-35, 
Salem, Massachusetts, 1898. 
Describes the geologic features of the region. 
258 Holyoke folio, Massachusetts-Connecticut. 
U. S. Geol. Surv., Geol. Atlas of the U. S., Folio No. 50, 1898. 
Describes the topography, the character, and occurrence of the rocks 
of the Algonkian, Cambrain, Silurian, Devonian, Carboniferous, .Jura- 
Trias, and Pleistocene periods of western Massachusetts and of the 
Holyoke quadrangle. Describes the post-Glacial deposits and the 
occurrence of building stones and clay. Includes topographic and 
geologic maps of the Holyoke quadrangle. 
