In the early 1950’s, during the Korean conflict, Peter Roeder was drafted into the US Army and stationed in San Francisco, where a local gentlemen’s club allowed young soldiers to use its library. Peter, who had recently graduated from Tufts University with a B.Sc. in Geology, took advantage of this offer and it was there that he discovered Bowen’s “The Evolution of the Igneous Rocks.” Entranced by the rigor of Bowen’s approach to fractional crystallization, he decided then and there to pursue graduate studies in experimental petrology at Pennsylvania State University. Professors O.F. Tuttle and E.F. Osborn at Pennsylvania State...

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