PEOFESSOE TTTsTDALL ON THE VEINED STEUCTUEE OE GLACIEES. 
293 
Fig. 9 represents a crumpled portion of the ice, with the lines of lamination passing 
through those of bedding at a high angle. Fig. 10 represents a case where a fault 
Fig. 9. 
Eig. 10. 
occurred, the veins at both sides of the line of dislocation ah being inclined towards 
each other. The lines mw, mn represent of course the lines of bedding, and the lines 
crossing them the structure. These observations arfe conclusive as regard the claims of 
the rival theories of structure and stratification *. 
§ 8. On the White Ice-seams of the Glacier du Geant, and their relation to the Veined 
Structure. 
From an elevated point at Trelaporte I observed a remarkable system of white bands 
sweeping across the Glacier du Geant in the direction of the structure. From one of the 
moraines near the junction of the three tributary glaciers, the same system of bands 
present a very striking appearance. They consist of a hard white ice, more resistant 
than the general mass of the glacier, and in some cases rising to a height of three or 
four feet above the surface. On close examination I found that they penetrated the 
Eig. 11. 
glacier only to a limited depth. In fig. 11 I have given the sections of two of these 
* While correcting this proof, I find a case of this kind figured by M. Agassiz in the atlas to his ‘ Sj^steme 
G-laciaire,’ pi. 8. fig. 3. 
MDCCCLIX. 2 K 
