Our transcription: Bowen developed this series in response to the idea of what was the origin, the question what is the origin of granite. He felt that all magmas originally started out as basaltic material, but through a process of differentiation, the magma evolved and changed. The early crystallizing materials, the materials that were crystallized at higher temperature would tend to settle out or become separated in some way from the magma. This process is called "differentiation",. It demonstrates how a magma might evolve, so that you can change from what was originally a "mafic" magma into a "felsic" magma consisting of the lower melting minerals.
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