GLACIAL GLIOLOGY OF XORTIL GREENLAND 



785 



lar^c proportion of the glaciers visited. Where present, they 

 sometimes showed themselves on the surface of the ice, so that 

 in crossing the glacier, lining parallel to its axis was conspicu- 

 ous. The lining was often emphasized by the fact that certain 



Fig. II. — Edge of Tooktoo glacier, next a nunatak separating it from the Bow- 

 doin glacier. A few miles above the head of Bowdoin Bay. 



veins, presumably of less compact ice, melted more readil}^ than 

 others, thus developing grooves, between which the edges of 

 the more resistant layers stood out as ridges. These vertical- 

 longitudinal veins are of various thicknesses, but usually less 

 than an inch. In some glaciers, notabl}- in the western glacier 

 of the north side of Herbert Island, there was a double ribbinsf 

 of the surface, as shown in the accompanying diagram (Fig. 13). 

 The larger swell or ridge, made up of many minor ones with 

 their intervening grooves, seemed to be due, in some cases, to the 



