yetil Structure of Glacier Ice. 135 



Fact 1. We had not walked for half an hour on the ice, 

 when I directed the attention of my companions to what I 

 called a vertical stratification pervading the ice. It appeared to 

 me so plain, that it scarcely occurred to me that it could be new 

 to M. Agassiz, who had so often traversed the same ground. 



Fact 2. M. Agassiz having his attention called to the fact, 

 stated that he thought 1 was deceived in considering that it 

 penetrated the ice ; that, indeed, the surface of the glacier 

 seemed to him much changed since last year, but that he had 

 observed superficial linear mar kin (js of the same kind on (I 

 think) the Glacier du Bois. 



Fact 3. At each new crevasse we came to, I took pains to 

 shew him that the apparent strata penetrated into the mass 

 of the glacier ; but he seemed incredulous, until I noticed a 

 deep hollow in the ice close to the left margiu of the medial 

 moraine between Hugi's and Agassiz' cabins, at least 20 

 feet deep, to which I called M. Agassiz' attention, in i)rouf of 

 the position 1 had maintained. 



Fact 4. To this he assented, but expressed his belief that 

 it would only be found in the neighbourhood of the moraine, 

 and not throughout the breadth of the glacier. 



Fact 5. In the course of the same afternoon, Ave ascertained, 

 by conjoint inspection, that the structure in question was 

 traceable all across the glacier of the Finster Aar. 



Fact 6. M. Agassiz, unwilling to admit that he could for- 

 merly have overlooked so palpable a structure, expressed a 

 frequent doubt whether this structure had not been superin- 

 duced since his last visit. 



Fact 7. 1 took the fol- 

 lowing means of prov- 

 ing that this could not 

 be the case. I shewed 

 him some crevasses, and 

 asked him how old he 

 supposed them to be ? 

 He answered, several 

 years ; they certainly 

 had not opened since 

 last summer (1840.) I 

 shewed that the veined 

 structure crossed these 



