SMITHSONIAN INSTITUTION

SPENCER F. BAIRD, Secretary
S. P. LANGLEY, Assistant Secretary,
in charge of Exchanges, Publications and Library
G. BROWN GOODE, Assistant Secretary,
in charge of U. S. National Museum

OFFICE OF ASSISTANT SECRETARY
IN CHARGE OF U. S. NATIONAL MUSEUM

Washington, May 12, 1887.

Professor O. C. Marsh :
New Haven, Connecticut.

Dear Sir :

I am, Sir,