128 



VISCOUS THEORY OF GLACIER MOTION. 



[1846. 



results deduced from Balmat's observations at the four follow- 

 ing stations : * 



Bois I. On the Glacier des Bois a little way below the 

 Chapeau, at about one-third of the breadth of the glacier from 

 its eastern bank. 



Bois II. On the Glacier des Bois near its lowest extremity, 

 behind the Cote du Piget, and near its centre. 



BOSSONS I. Upper station on the Glacier des Bossons, some 

 way above the plateau where the glacier is usually crossed ; on 

 the west side, near the moraine. 



BOSSONS II. Near the lowest extremity on the Glacier of 

 Bossons, where free from the moraine, on the western side. 



These four sets of observations are projected in Plate IV., 

 where the four lower zigzag curves represent the gradation 

 of diurnal velocity by periods, according to the method adopted 

 in projecting my own observations in my Travels, p. 141. 

 The general accordance is sufficiently manifest, and the 



* [This table is abridged from those in the Philosophical Transactions for 1846, 

 pp. 183 and 184, where the days and hours of each observation are more accurately 

 given, and the total motions. The days of observation are, in general, the same 

 for all the stations, but not precisely so in a few instances.] 



