CHAPTEE X. 



1840-1842: .ET. 33-35. 



Summer Station on the Glacier of the Aar. Hotel des 

 Neuchatelois. Members of the Party. Work on the 

 Glacier. Ascent of the Strahleck and the Siedelhorn. 

 Visit to England. Search for Glacial Remains in Great 

 Britain. Roads of Glen Roy. Views of English Natu- 

 ralists concerning Agassiz's Glacial Theory. Letter from 

 Humboldt. Winter Visit to Glacier. Summer of 1841 

 on the Glacier. Descent into the Glacier. Ascent of the 

 Jungfrau. 



IN the summer of 1840 Agassiz made his 

 first permanent station on the Alps. Hitherto 

 the external phenomena, the relation of the 

 ice to its surroundings, and its influence upon 

 them, had been the chief study. Now the 

 glacier itself was to be the main subject of in- 

 vestigation, and he took with him a variety of 

 instruments for testing temperatures : barome- 

 ters, thermometers, hygrometers, and psychoni- 

 eters ; beside a boring apparatus, by means of 

 which self-registering thermometers might be 

 lowered into the heart of the glacier. To 

 these were added microscopes for the study of 



