Plate 4 



Upper figure. Hyperite. Feldspars uncrushed, pyroxenes partially granu- 

 lated. From a dike in Croghan mass, s.e. zone of metamorphism. Photo- 

 micrograph. Crossed nicols. x 40 



Lower figure. Hyperite. More crushed than preceding rock. Feldspars 

 are granulated. From dike in granite in central zone of metamorphism, 

 n.w. of Croghan in Diana mass. Photomicrograph. Crossed nicols. x 40 



