Plate XII 



THE DELINEATION OF THE GRAIN OF THE GLACIER. 



Fig. 8. Shows the delineation of the grain in Winter by the condensation 

 of moisture in the form of hoar-frost on the roof of the grotto. 



Fig. 9. Shows the revelation of the grain in Summer on a pillar in the interior 

 of the grotto which received subdued daylight from the entrance. 



