APPEND. B.] FORBES, GUYOT, AND AGASSIZ. 545 



being fairly extracted in conformity with the tenour of the 

 letters to which they belong. If any doubt shall be raised on 

 this point, I shall have only the disagreeable alternative of pub- 

 lishing the entire correspondence, the length of which would 

 render it unsuitable for the pages of a scientific journal. But 

 I repeat rny belief that the extracts I shall make, and the narra- 

 tive with which I shall connect them, will put the matter 

 in a light sufficiently clear ; and for the facts which I shall 

 have to state, I am conscious of their admitting of no colouring 

 or denial. 



In the first place, I shall briefly state the circumstances 

 under which the observation of THE VEINED STRUCTURE IN THE 

 <>F GLACIERS l was made. 



In the second place, I shall explain the circumstances under 

 which I made it public. 



In the thin! place, I shall discuss shortly the claims to priority 

 of observation which have subsequently been made. 



I. 



In 1840, M. Agassiz invited me to make a tour with him 

 the next summer amongst the glaciers of the Oberland, Vallais, 

 and Savoy. I understood the invitation to extend simply to 

 our mutual companionship on a journey of mutual interest. 

 Of third parties there was no mention ; and it was with diffi- 

 dence that I requested permission for my friend and fellow- 

 ller, Mr. Heath, Fellow and tutor of Trinity College, Cam- 

 bridge, to increase the number. It was only after all preli- 

 minaries were arranged, and after I had agreed, in order to 

 accommodate M. Agassiz, to change the direction in which I 

 proposed to commence our intended tour, that I learned that he 

 several friends in company with him ; and it was not until 

 my arrival at the (Iriniscl, on the Sth of August, that I learned 

 that the plan of a tour, into which I had originally gone, had 

 been abandoned by my fellow-traveller, for reasons which he did 

 not assign, and that I was expected to unite with the party he 

 had formed at Neufchatel, to spend BOme time mi the glacier of 

 instead of prosecuting tin; journey originally proposed. 

 I elie'-rfully acquiesced, however, in the incut, which 



promised to give me a good insight into the structure ol 



proposed farther to study by prosecuting alone, or with 

 Mr. Heath, my originally projected tour to Monte Rosa and 

 4 Blanc. 



is to be remembered that tlie<;i;ui Aar was tin- 



one which & Agaasiz bad already repeatedly visited in f.<; 

 1 So. ,>. 89. 



