Earliest in date as it is greatest in bulk stands Audubon's Birds of America in four volumes, containing four hundred and thirty-five plates, of which the first part appeared in London in 1827 and the last in 1838.
To Audubon's great work in two volumes, on the same scale - The New and Hitherto unfigured Species of the Birds of North America, containing life-size figures of all those which had been added to its fauna since the completion of the former.
Pp. 17,18) which he also examined; and he practically, though not literally,' asserted the truth, when he said that the general structure, but especially the muscular appendages, of the lower larynx was " similarly formed in all other birds of this family" described in Audubon's work.
The natural history collections (including the very large ichnological collection of President Hitchcock, and Audubon's collection of birds) are of exceptional richness.
By a crevice above they are connected with an arm of Audubon's Avenue.
Audubon's Avenue, the one nearest the entrance, is occupied in winter by myriads of bats, that hang from the walls in clusters like swarms of bees.