U. 8. GEOGRAPHICAL SURVEYS WEST OF THE ONE HUNDREDTH MERIDIAN. 
ist Lirzut. GEO. M. WHEELER, Corps or ENGINeeRs, U. 8. ARMY, IN CHARGE. 
FERNS OF THE SOUTHWEST: 
AN ACCOUNT OF THE FERNS WHICH HAVE BEEN COLLECTED IN SO MUCH 
OF THE TERRITORY OF THE UNITED STATES OF AMERICA AS IS 
WEST OF THE 10571 DEGREE OF W. LONGITUDE, AND 
SOUTH OF THE 40TH DEGREE OF N, LATITUDE, 
BY 
DANIEL C. EATON, 
PROFESSOR OF BOTANY IN YALE COLLEGE. 
