320 LOUIS AGASSIZ. 



lated. In addition to his usual collaborators, 

 M. Desor and M. Vogt, he had, therefore, in- 

 vited as his guest, during part of the season, 

 the distinguished physicist, Professor James 

 D. Forbes, of Edinburgh, who brought with 

 him his friend, Mr. Heath, of Cambridge. 1 

 M. Escher de la Linth took also an active part 

 in the work of the later summer. To his 

 working corps Agassiz had added the foreman 

 of M. Kahli, an engineer at Bienne, to whom 

 he had confided his plans for the summer, and 

 who furnished him with a skilled workman to 

 direct the boring operations, assist in measure- 

 ments, etc. The artist of this year was M. 

 Jaques Burkhardt, a personal friend of Agas- 

 siz, and his fellow-student at Munich, where he 

 had spent some time at the school of art. As 

 a draughtsman he was subsequently associated 

 with Agassiz in his work at various times, and 

 when.they both settled in America Mr. Burk- 

 hardt became a permanent member of Agas- 

 siz's household, accompanied him on his jour- 

 neys, and remained with him in relations of 

 uninterrupted and affectionate regard till his 

 own death in 1867. He was a loyal friend 



1 As the impressions of Mr. Forbes were only made known 

 in connection with his own later and independent researches 

 it is unnecessary to refer to them here. 



