1865-1868: AGE 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 Journey.--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.--Summer Journey in the West.
--Cornell University.--Letter from Longfellow.