THE 



AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] 



Art. XY. — The Evolution of the Horse Family, as illus- 

 trated in the Yale Collections / by Richard S. Lull. 



[Editorial Note. — This paper has been prepared as a guide to a portion 

 of the paleontological collections in the Peabody Museum of Yale Univer- 

 sity. The great interest of the subject, however, and the completeness of the 

 Tale material illustrating it seem to make a wider publication desirable.] 



Part I. 



It is seldom that the paleontologist is able to show so com- 

 plete a series representing the evolution of a race of land ani- 



Fig. 1. Skeleton of the modern horse, Equus caballus. (After Marsh.) 



mals as in the case of the horse, and it is even more exceptional 

 that an institution is fortunate in having so comprehensive a 

 collection as that now in the Peabody Museum at Yale, which 

 was brought together through years of constant watchfulness 

 on the part of the late Professor Othniel Charles Marsh. 



Am. Jour. Sci. — Fourth Series, Vol. XXIII, No. 135.— March, 1907. 

 12 



