Abstract
The detailed studies on rocks of the prasinite-green schist facies published during the last decade have thrown a flood of light on the genetic relations of the various members of this facies group. References may be made to the work of Vogt at Sulitelma (l),1 Fischer in the Wippra metamorphic zone (2), Weg's studies in the Saxon Zwischengebirge (3), Turner's contributions on the Otago schists (4), and finally in this country to Wiseman's study of the progressive metamorphism of the Dalradian epidiorites (5).

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