The Andes of southern Peru . er cent . .neve must attain a thickness of at least 125 feet in order that itmay have motion,^ though as a result of the different line ofobservations Hobbs concludes ^ 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 cli
The Andes of southern Peru . er cent . .neve must attain a thickness of at least 125 feet in order that itmay have motion,^ though as a result of the different line ofobservations Hobbs concludes ^ 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 * F. E. Matthes, Glacial Sculpture of the Bighorn Mountains, Wyoming, TwentiethAnn. Rept. U. S. Geol. Surv., 1899-1900, Pt. 2, p. 181. Idem, p. 190.° W. H. Hobbs, Characteristics of Existing Glaciers, 1911, p. Fig. 191.
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