HORNED ANIMALS 
explanation with reference to their structure. In the 
different species of rhinoceros the horns are attached, 
and grow with the skin of the animal ; they are not 
holloio, nor are they supported by a bony core, as in the 
bovine group. They (the horns) are not of a bony sub- 
stance, as in the cervine group, but are composed of a 
substance of agglutinated hair, resembling the structure of 
the hoofs. The horns of the rhinoceros ffrow durinof the 
animal’s life, but by the constant wearing down they are 
kept in working order, and are, when the animal lives in a 
wild state, tolerably sharp-pointed. 
THE PRONG BUCK, OR PRONG -HORNED ANTELOPE OF 
AMERICA. 
Previously to my paper, which was published in the 
Frocecclings of the Zoologieal Soeieiy November 28, 1865, 
nothing was known, positively, to the scientific naturalist 
of the true nature of the horns of this very remarkable 
beast. 
I proved, incontestably, the j)eculiar and unique con- 
dition of the shedding and the reproduction of the horns 
of this singular animal. 
It may appear strange and almost incredulous that, soon 
after my paper was read in America, the Smithsonian 
Institution, with its great reputation, should forward a 
letter to the Zoological Society with the extraordinary 
statement that they had had this letter in their possession 
for eight years, unnoticed and unpublished, detailing and 
describing all that I had stated without making the 
slightest allusion to what I had already settled. 
If there were any truth (which is much doubted) in the 
statement that Dr. Canfield had made the same discovery 
247 
