real ijti'acture of Glacier Ice. 1^1 



verrez par la que si vous avez pu croire avoir fait une decouverte a ce 

 suiel, ce n'a pu etre qu'en mccomprenant ce que j ai pu vous dire* sur la 

 profondeur a laquelle ces lames descendent, et qui navaient ete remar- 

 quees qu'a une faible profondeur avant 1841, et par moi seulemcnt dans 

 le voisinage des moraines. 



[Here follows the Letter, and Extract Eleventh.] 

 "Ju^ez maintenant sij'ai du etre surpris de vos reclamationst et si 

 Vetais en droit dy repondre comme je I'ai fait. N'ayant pas 1 habUude 

 "de tenir un journal reguller des moindres particularites des observations 

 que le fais, et addressant dans nos societes scientifiques toutes mes com- 

 munications de Vive voix, ees fails ne me sont revenus a moi-meme avec 

 les circonstances accessoires que lorsque mes amis me les ont rappeles. 



'ie ^ ^ 



* * * 



"Nctifchatcl, 28 Avril 1842." 



After receiving the preceding letter, I gave up all thoughts 

 of attempting to convince M. Agassiz respecting the history 

 of this, or indeed of any, scientific question. In the course 

 of a few months, he had entertained four different opmions 

 respecting the authorship of the discovery in question and 

 still. 1 suppose, has some douht as to whether he disco- 

 vered it himself in 1838, or only in 1841 ; or whether he 

 learned it from M. Guyot at Porrentruy, or from me at the 



glacier of the Aar. 



The structure in question, which is common to every glacier 

 in which I have looked for it, is in some so exceedingly strik- 

 ing that it would seem impossible to escape notice. buch 

 for instance, is the case with a glacier of great beauty and 

 extent, and which is remarkable from being almost touched 

 by a frequented mule-road, whence the structure is admirably 

 seen,-! mean the glacier of La Brenva, near Courmayeur. 

 That it has not been described by any of the modern writers 

 on glaciers, De Saussure, De Charpentier, Hugi, Agassiz, or 



* See Extract Second for M. Agassiz' o^vn account of what he did tell 

 me of his previous observations. • j • „„ 



t Of course I maintain that he had no right whatever to be surprised since 

 it appears from the following sentence, that he was equally >g---^ ^^^ 

 myself of what he had himself done in 1838, until receivmg M. Dubois 

 leUer, dated the day before this was written :-" Cc.faiis nc rac sont rcve- 

 nus A moi-mc.ue avec les circonslauccs acceccoircs que lorsque me> amu mc 

 les out rappeles." 



