The accumulation of the data for a geologic map of Brazil was begun by me in 1874, when I first went to that country, and has been kept up, as opportunities offered, down to the present time. The gathering and study of the material and the preparation of the map may therefore be said to represent the work of a considerable portion of a lifetime.
The data brought together on the map and in the accompanying text are published by the Geological Society of America primarily as a contribution to the world’s knowledge of the geology of America; but, so far as I am concerned, it is meant especially to be of service to the Brazilian people, among whom I have spent many years, to whom I am strongly attached, and in whose welfare I am deeply interested.
It has been one of the greatest pleasures of my life that . . .