17 



very strong reason for confiding in the absolute fidelity with which 

 the observations have been made and transmitted to me. 



TABLE shewing the mean daily motion in inches of the Glaciers of 

 Chamouni deduced from Balmat's Observations, and continued 

 from the Fourteenth Letter. 



" I have formerly taken occasion to mention experiments and ob- 

 servations which have occurred from time to time of a nature to con- 

 firm the fundamental hypothesis of the quasi fluidity of the ice of 

 glaciers on the great scale, and I cannot doubt that these incidental 

 remarks have tended to diminish the natural incredulity with which 

 that theory was at first received in some quarters. I have now to 

 cite a fact of the same kind established by a French experimenter, 

 M. Person, who appears not to have had even remotely in his mind 



* Mean of Geneva and Great St Bernard. 



VOL. III. 



