File:The Andes of southern Peru, geographical reconnaissance along the seventy-third meridian (1916) (14779549751).jpg

Identifier: andesofsouthernp00 (find matches)
Title: The Andes of southern Peru, geographical reconnaissance along the seventy-third meridian
Year: 1916 (1910s)
Authors: Bowman, Isaiah, 1878-1950 American Geographical Society of New York
Subjects: Yale Peruvian Expedition (1911) Physical geography Geology Human geography
Publisher: (New York) Pub. for the American Geographical Society of New York by H. Holt and Company
Contributing Library: Wellesley College Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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cent . . .neve must attain a thickness of at least 125 feet in order that itmay have motion,5 though as a result of the different line ofobservations Hobbs concludes 6 that a somewhat greater thicknessis required. The snow cover in tropical mountains offers a number of solidadvantages in this connection. Its limits, especially on the Cordil-lera Vilcapampa, on the eastern border of the Andes, are subjectto small seasonal oscillations and the edge of the perpetualsnow is easily determined. Furthermore, it is known from thecomparatively fixed quality of tropical climate, as Humboldtput it, that the variations of the snowline in a period of years donot exceed rather narrow limits. In mid-latitudes on the con-trary there is an extraordinary shifting of the margin of the snow 4 F. E. Matthes, Glacial Sculpture of the Bighorn Mountains, Wyoming, TwentiethAnn. Rept. U. S. Geol. Surv., 1899-1900, Pt. 2, p. 181. 5 Idem, p. 190. 6 W. H. Hobbs, Characteristics of Existing Glaciers, 1911, p. 22.
Text Appearing After Image:
Fig. 191.

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