1855-1860: AGE 48-53.
"Contributions to Natural History of the United States."
--Remarkable Subscription.--Review of the Work.--Its Reception in
Europe and America.--Letters from Humboldt and Owen concerning it.
--Birthday.--Longfellow's Verses.--Laboratory at Nahant.
--Invitation to the Museum of Natural History in Paris.--Founding
of Museum of Comparative Zoology in Cambridge.--Summer Vacation in
Europe.