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In the present Manual of GEOLOGY it has been the aim of the author rather to indicate the methods of geological inquiry and reasoning, than to present the learner with a tedious summary of results. Attention has therefore been directed chiefly to the physical branches of the science--Palaeontology and Historical Geology, which are very large subjects of themselves, having been only lightly touched upon.

James Geikie (1839 1915) was born in Edinburgh, and his work from 1861 as a field geologist for the Geological Survey in Scotland provided the evidence for the theories he proposes in this work, first published in 1874 (revised editions appeared in 1877 and 1894). Geikie brought together his own research and the findings of other geologists in Scotland to support his main thesis of 'drift' being evidence of the action not of sea ice but of land ice. He was influenced by James Croll's theory that changes in the Earth's orbit led to epochs of cold climate in one hemisphere and warm in the...