T. H. Holland. 



GEOLOGICAL SURVEY OF INDIA 



Memoirs, Vol. XXXIV, Pt. 2, Y\. VI 



Fig. 1 



Fig. 1 a 



Fig. 2 a 

 From Photographs by T. H. Holland. Uth., Geol. Surv. of India Office 



PERCUSSION - AND PRESSURE - FIGURES IN MUSCOVITE. 



Figures 1 and 2, from microphotographs magnified by 20 diameters. 



Figures ia and 2a, diagrams showing the angular relations of the cracks. 



