The Metamorphism of the South-West Highlands.

Last year, I published a theory of the structure of the South-West Highlands in which was included a short statement regarding the metamorphism of the district (1922, p. 92). It seems that movement and metamorphism in this particular region have been too closely contemporaneous to allow of a tectonist deriving much assistance, in the initial stages of his work, from a study of the metamorphic condition of the various rocks with which he has to deal. There is no suggestion anywhere of contrasted metamorphisms having been brought into contact as a result of thrusting. If, as I suppose, there have been great thrust-movements, these must, for the most part, have occurred before the conclusion of the metamorphic period.