First Sentence:
In reviewing the various attempts which have been made towards a classification of eruptive rocks-that is, those crystalline rocks made up of silicates, which, without showing themselves any traces either of stratified deposition or foliation, enter into the structure of the surface of the globe in such a way as to be unconformable with the stratification of the neighboring sedimentary rocks, and as a rule to abut against them without any gradual passage-we are struck by the observation that, if they are based on any principles at all, these are usually artificial, while none but unsatisfactory results have been obtained when the application of natural principles has been tried.
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Sierra Nevada, Lassen's Peak, Rocky Mountains, Great Basin, Silver Mountain, North America, South America, Central America, Clarence King, New Zealand, Only Family
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