Return to Cambridge.—Removal of Collection to New Museum Building.
—Distribution of Work.—Relations with his Students.—Breaking out
of the War between North and South.—Interest of Agassiz in the
Preservation of the Union.—Commencement of Museum Publications.
—Reception of Third and Fourth Volumes of "Contributions."—Copley
Medal.—General Correspondence.—Lecturing Tour in the West.
—Circular Letter concerning Anthropological Collections.—Letter
to Mr. Ticknor concerning Geographical Distribution of Fishes in
Spain.
CHAPTER 20.
1863-1864: AGE 56-57.
Correspondence with Dr. S.G. Howe.—Bearing of the War on the
Position of the Negro Race.—Affection for Harvard College.
—Interest in her General Progress.—Correspondence with Emerson
concerning Harvard.—Glacial Phenomena in Maine.
CHAPTER 21.
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.
CHAPTER 22.
1868-1871: AGE 61-64.
New Subscription to Museum.—Additional Buildings.—Arrangement of
New Collections.—Dredging Expedition on Board the Bibb.—Address
at the Humboldt Centennial.—Attack on the Brain.—Suspension of
Work.—Working Force at the Museum.—New Accessions.—Letter from
Professor Sedgwick.—Letter from Professor Deshayes.—Restored
Health.—Hassler Voyage proposed.—Acceptance.—Scientific
Preparation for the Voyage.