Veined Structure and Motion. 101 



glacier lying then more in the trough of the valley, not heing 

 violently pressed against the promontory B and embayed in 

 the height C, the friction and longitudinal tearing force was 

 incomparably less. I wish I could convey any adequate idea 

 of the beauty of the ice for an extent of some hundred feet 

 in length, and for a comparatively trifling breadth between 

 D and E. It resembled the greenish veined marble called 

 by the Italians Cipollino, when of the highest perfection, 

 and polished or wetted ; and it was impossible to resist the 

 wish to carry off slabs, and to perpetuate it by hand speci- 

 mens in cabinets. 



I did not, however, content myself with arguing the rela- 

 tive motions of the parts of the ice and embaying of the rest, 

 from the mere configuration of the ground. But I made the 

 following experiments, which proved that my first belief was 

 correct. 



The instrument being stationed at B, and a transverse 

 visual line established with reference to an object on the 

 farther side of the glacier, two vertical holes were made 

 at (1) and (2), the first on the nearer, the second on the 

 farther side of the remarkable veined structure already de- 

 scribed. If that structure was occasioned, as I suspected, 

 by the rapidity with which the farther portion of the ice was 

 moved past the nearer portion, such difference of velocity 

 might be expected to be observed in a marked manner. The 

 mark (1) was about 50 feet from the nearest edge of the 

 glacier, and 103 feet below the station B. The mark (2) 

 was about 170 feet farther and 60 feet higher. An approxi- 

 mate section of this part of the glacier, together with the 

 measurements on which it is founded, is given in Plate II., 

 fig. 4, and will serve to compare the state of matters at any 

 future time. The following Table gives the result of the 

 motions for two days : — 



