CHAPTER XXI. 



1865-1868 : ^T. 58-61. 



Letter to his Mother announcing Journey to Brazil. Sketch 

 of Journey. Kindness of the Emperor. Liberality of 

 the Brazilian Government. Correspondence with Charles 

 Sumner. Letter to his Mother at Close of Brazil Jour- 

 ney. Letter from Martius concerning Journey in Brazil. 



Return to Cambridge. Lectures in Boston and New 

 York. Summer at Nahant. Letter to Professor Peirce 

 on the Survey of Boston Harbor. Death of his Mother. 



Illness. Correspondence with Oswald Heer. Sum- 

 mer Journey in the West. Cornell University. Letter 

 from Longfellow. 



THE next important event in the life of 

 Agassiz, due in the first instance to his fail- 

 ing health, which made some change of scene 

 and climate necessary, is best announced by 

 himself in the following letter. 



TO HIS MOTHER. 



CAMBRIDGE, March 22, 1865. 



DEAR MOTHER, You will shed tears of 

 joy when you read this, but such tears are 

 harmless. Listen, then, to what has happened 

 A few weeks ago I was thinking how I should 



