weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1895. 29 
70 Case (E. 0.). Experiments in ice motion. 
Jour, of Geol., vol. iii, pp. 918-934. 
Describes and illustrates the experiments undertaken to show the ex- 
istence of differential movements or currents in the ice bottom, and dis- 
cusses tho relation of the experiments to observed phenomena in ice. 
71 Cazin (F. M. F.). [The genesis of ore deposits.] 
Am. Inst. Mg. Pngrs., Trans., vol. xxiv, pp. 995-996. 
In discussion of paper by F. Posepny on the same subject. 
7:2 Chalmers (Robert). On the glacial lake St. Lawrence of Prof. 
Warren Upliam. 
Am. Jour. Sci., 3d ser., vol. xlix, pp. 273-275. 
States the author's reasons for considering that there did not exist a 
glacial lake occupying the St. Lawrence Valley from Quebec to Lake 
Ontario, and that there are no evidences of a movement of a great ice 
sheet over this region at any time during the Glacial period. 
73 Chamberlin (T. 0.). Recent glacial studies in Greenland. 
Geol. Soc. Am., Bull., vol. vi, pp. 199-220, pis. 3-10. 
Abstract: Sci. Am. Suppl., vol. xxxix, p. 15876, and vol. xl, pp. 16275- 
16276. 
Compares tho glaciatiou of the mainland of North America and that 
of Greenland, and discusses tho relation of geologic formations of the 
region to glaciation. Describes the stratification of the glaciers and 
gives a discussion of tho causes of their movements. Describes eskers, 
kames, drunilins, and other glacial phenomena of Greenland. 
71 Notes on the glaciation of Newfoundland. 
Abstract : Geol. Soc. Am., Bull., vol. vi, p. 467 (f p.). 
Describes the local character of the glacial phenomena of Newfound- 
land. 
75 Glacial studies in Greenland. 
Jour, of Geol., vol. iii, pp. 61-69, 198-218, 469-480, 565-582, 668-681, and 
833-843. 
Describes the topographic and geologic features of the western coast 
of Greenland, and discusses their bearing on tho glacial phenomena. 
Describes the characteristics of the various glaciers which occupy this 
portion of Greenland. Includes sketch maps of portions of the region 
and many illustrations of the glacial phenomena from photographs. 
76 The classification of American glacial deposits. 
Jour, of Geol., vol. iii, pp. 270-277. 
Describes the Kansan, Aftonian, Iowa, Toronto, and Wisconsin forma- 
tions and the later deposits. 
77 Clark (Ellis). The silver mines of Lake Yalley, New Mexico. 
Am. Inst. Mg. Engrs., Trans., vol. xxiv, pp. 138-167. 
Describes the occurrence of Silurian and Carboniferous formations in 
this district and tho character and distribution of the associated igneous 
rocks. Describes the mining operations and gives several cross sections 
of ore bodies, accompanied by a topographic and geologic map. 
