Geology . e features arepresumed to have been extended and intensified during the glacialstages, but to have retained the general relations and configurationsthey now possess. The basal cause of these features is probably tobe found in the configuration of the land and water of the northernhemisphere. 2. Periodicity. — The periodicity of glaciation under this hypoth-esis is assigned to a rather complex interaction of a combination ofagencies which is not susceptible of brief statement without morequalification than our limits will permit, if it is to be wholly accu-rate and fully protected aga
Geology . e features arepresumed to have been extended and intensified during the glacialstages, but to have retained the general relations and configurationsthey now possess. The basal cause of these features is probably tobe found in the configuration of the land and water of the northernhemisphere. 2. Periodicity. — The periodicity of glaciation under this hypoth-esis is assigned to a rather complex interaction of a combination ofagencies which is not susceptible of brief statement without morequalification than our limits will permit, if it is to be wholly accu-rate and fully protected against misinterpretation; but the leadingfeatures may be sketched and the necessary qualifications must betaken for granted. The basal conception is that, under general conditions favorable 1 An Attempt to Frame a Working Hypothesis of the Cause of Glacial Periods onan Atmospheric Basis. Jour. Geol., Vol. VII, 1899, pp 752-771. See also discussionof localization under Permian, Vol. II, p. 674. 434 THE PLEISTOCENE OR GLACIAL PERiOD. 4<55
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