BO THE FORMS OF WATER IN 



197. Our conjecture is fully verified. The maximum 

 motion here is seven inches a day less than that of the 

 Mer de Glace at Trelaporte (192). 



198. And now for the Lechaud branch. On August 

 1 we fix ten stakes across this glacier above the point 

 where it is joined by the Talefre. Measured on August 

 3, and reduced to twenty-four hours, the motion was 

 found to be — 



MOTION OF GLACIER DE LECHAUD. 



Seventh Line: KK' upon Sketch. 

 Stake ..12 3 456789 10 

 Inches .58 10 998697 6 



199. Here our conjecture is still further verified, the 

 rate of motion being even less than that of the Glacier 

 du Geant. 



§ 28. Motion of Top and Bottom of Glacier. 



200. We have here the most ample and varied evi- 

 dence that the sides of a glacier, like those of a river, 

 are retarded by friction against its boundaries. But 

 the likeness does not end here. The motion of a rivei 

 is retarded by the fiiction against its bed. Two 

 observers, viz. Prof. Forbes and M. Charles Martins, 

 concur in showing the same to be the case with a 

 glacier. The observations of both have been objected 

 to ; hence it is all the more incumbent on us to seek 

 for decisive evidence. 



201. At the Tacul (near the point a upon the sketch 



