PETROLOGY. AND MINERALOGY, 1896. 75 
570 Reid (Harry Fielding). Notes on glaciers. 
Abstract: Geo]. Soc. Am., Bull., vol. vii, p. 508 (fp.), 1896. 
Brief remarks on the movements of existing glaciers in western 
Xorth America. 
.571 The mechanics of glaciers. I. 
Jour, of Geol.. vol. iv, pp. 912-928, 189G. 
Discusses the flow, stratification, form of surface, and variations of 
glaciers. 
572 Variations of glaciers. 
Science, new ser., vol. iii, p. 867, 1896. 
Discusses methods of observing glacial phenomena. 
57.3 The flow of glaciers. 
Johns Hopkins Univ. Circ, vol. xv, pp. 90-91 (ip.), 1896. 
Gives a brief summary of conclusions. 
574 Rickard (T. A.). Vein walls. 
Am. Inst. Mg. Engrs.. Trans., vol. xxvi, pp. 193-241, 33 figs. ; Mining and 
Scientific Press., vol. lxxii, pp. 152, 172, 194, and 216-217, 1896. 
Describes and illustrates the phenomena, of vein walls in different 
mines and discusses the formation of ore bodies. 
575 Enterprise mine, Rico, Colo. 
Am. Inst. Mg. Engrs., Trans, vol. xxvi ; 75 pp.. 46 figs., 1896. 
Describes the occurrence of the gold and silver ores and the character 
and structure of the vein system. 
57G [Geology of the Cripple Creek district of Colorado.] 
In discussion of paper by Whitman Cross on the same snbjcct. See 
No. 150. 
577 The Cripple Creek gold field [Colorado]. 
Mining and Scientific Press, vol. lxxii, pp. 284-285, 1896. 
Describes the general geologic features of the region and the. occur- 
rence of the gold ores. 
578 Ries (Heinrich). The limestone quarries of eastern New York, 
western Vermont, Massachusetts, and Connecticut. 
U. S. Geol. Surv., 17th Ann. Rept.. Pt. Ill (cont. i. pp. 795-S11, 1896. 
Describes local details of Cambrian and Silurian limestones in the 
States named and gives a number of chemical analyses. 
570 The monoclinic pyroxenes of New York Stare. 
X. Y. Acad, of Sci., Annals, vol. ix. pp. 124-180, pis. xiii-xvi, 1896. 
Presents a bibliography of the subject, describes the crystallographic, 
optical, and chemical characters of the pyroxenes and discusses the 
genesis of Xew York pyroxenes. 
580 Luquer | Lea Mel.) and. The "Augen"- gneiss area, pegmatite 
veins, and diorite rocks at Bedford, X. Y. 
See Lu<|uer (Lea Mel.) and Ries (H.), No. 156. 
