1860-1863: AGE 53-56.
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.