weeks] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1901. 83 
752 Upham (Warren). Artesian wells in North and South Dakota. 
Minn. Acad. Nat. Sci., Bull., vol. 3, pp. 370-379, 1901. 
753 Pre-Glacial erosion in the course of the Niagara gorge, and 
its relation to estimates of post-Glacial time. 
Am. Geol., vol. 28, pp. 235-244, 1901. 
Gives the author's views of the glacial history of the region and dis- 
cusses their bearing on estimates of post-Glacial time. 
754 The antiquity of the races of mankind. 
Am. Geol., vol. 28, pp. 250-254, 1901. 
Reviews the evidences indicating the pre-Glacial origin of man. 
755 [Review of u Iowa Geological Surve}^, volume ll.' n 
Am. Geol., vol. 28, p. 258, (J p.), 1901. 
756 The Toronto and Scarboro drift series [Ontario]. 
Am. Geol., vol. 28, pp. 306-316, 1901. 
Quotes Coleman's description of these beds and discusses the bearing 
of the evidences on the existence of interglacial epochs of moderate 
oscillations of the ice border. 
757 [Review of "Geological Survey of Canada, Annual Report, 
new series, volume 11, 1898."] 
Am. Geol., vol. 28, pp. 321-322, 1901. 
V. 
758 Van Hise (Charles R.). Some principles controlling the deposi- 
tion of ores. 
Am. Inst. Mg. Engrs., Trans., vol. 30, pp. 27-177, figs. 1-10, 1901. 
Abstracts: Am. Jour. Sci., 4th ser., vol. 11, p. 90 (| p.), 1901; Eng. & 
Mg. Jour., vol. 72, pp. 699-702, 1901. 
This subject is discussed under the fol lowing general heads: Three 
zones of the lithosphere; the water content and openings in rocks; 
physico-chemical principles controlling the work of underground waters; 
general geologic work of underground waters; the precipitation of ores 
by ascending waters; precipitation of ores by ascending and descending 
waters combined; the association of certain ores; concentration; enrich- 
ment and diminution of richness in depth; special factors affecting the 
concentration of ores, and the classification of ore deposits. 
759 The iron-ore deposits of the Lake Superior region. 
U. S. Geol. Surv., 21st Ann. Rept., Pt. Ill, pp. 305-434, pis. xlviii-lix, 
1901. 
Describes the general stratigraphy and occurrence of iron ores in the 
several districts of the Lake Superior region. The Mesabi district is by 
C. R. Van Hise and C. K. Leith. The Vermillion iron-bearing district 
is by C. R. Van Hise and J. Morgan Clements. 
760 The geology of ore deposits. 
Science, new ser., vol. 14, pp. 745-757, figs. 1-6, 785-793, L901. 
Abstract: Sci. Am. Suppl., vol. 52, p. 21501, 1901. 
Discusses the evidences that metallic ores and gangue are deposited 
by underground waters. 
