INTRODUCTION. Vij 
done by Nichols. This method of representing small skulls promised more 
accuracy than seemed to be attainable, after several trials, by hand-drawing ; 
but the figures should not be relied upon too implicitly. 
A short abstract of this paper appeared in the “Proceedings” of the 
Philadelphia Academy for 1874. 
T am, Sir, &e., 
ELLIOTT COUES. 
Dr. F. V. Haypsn, 
U.S. Geologist, &c., 
Washington, D. C. 
