After my return to the United States, I planned with him my Expedition to the Brazilian coast in 1867, the accomplishment of which would not have been possible but for his generous pecuniary aid.
In the preparation of a volume on the "Geology and Physical Geography of Brazil", I was helped in many ways by the same friend, who even went so far as to make, under my direction, a journey in the Province of São Paulo, for the purpose of ascertaining the general geological structure of this part of the Brazilian plateau. His carefully made observations have since been verified.
The same friend acted as my agent in connection will the two "Morgan Expeditions" to the Amazonas in 1870 and 1871, and to his judicious management was largely due the success of these two Expeditions, as well as the safety of the collections. But for his constant assistance and encouragement I would not be in Brazil to day; indeed, but for Major O. C. James, I should long ago have been forced to abandon Brazil as a field for research.
In deference to his express wish, I have hitherto reluctantly refrained from making a full acknowledgement of my indebtedness; but to day, with it brought freshly to mind, I cannot refrain from giving this expression to the feelings of my heart.
Ch. Fred. Hartt.
Rio de Janeiro, April 23rd. 1875.