The writer has extracted and herewith presents what he considers to be the kernel of thought in each of several papers dealing with the crystallization of pyroxenes from basalts. Many of the concepts in these papers are built upon primary data presented in Wahl's classic paper (1907) “Die Enstatitaugite” and various general papers by J. H. L. Vogt. A number of other less fundamental articles dealing with pyroxenes in basalts might have been included but those quoted seemed sufficient to give the trend of ideas on the problem at hand.

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