NIMROD ON THE CONDITION OF THE HORSE. 31 
by frigid, temperate, and warm climates.” The elephas primo- 
genus is thus circumstanced, having been found in Yorkshire; 
and now associated (says Lyall) with recent shells in Siberia and in 
the warm regions of lat. 31°, in North America. 
The law of the succession of types, although subject to some 
remarkable exceptions, must possess the highest interest to every 
philosophical naturalist. Some of the animals we have been 
describing appear to have been created with peculiar kinds of 
organization, suited to particular areas ; and it does not seem ex- 
traordinary that their extinction, more than their creation, should 
exclusively depend on the nature (altered by physical changes) of 
their country. But as to the horse, for instance, his constitution 
appears suited to every climate; and we cannot account for their 
species being destroyed throughout the whole of the two continents 
of America, unless the change was much more considerable than 
we imagine it to have been. 
It would seem from what has been stated, that certain races of 
living beings and plants, suitable to peculiar conditions of the earth, 
were created, and when those states became no longer favourable 
for the continuance of such type or organization, according to the 
natural laws by which the conditions of their races were determined, 
they disappeared, and were succeeded by new forms. 
The reader will observe in the geological mutations we have 
briefly alluded to, that one simple inundation, one general catas- 
trophe, is not sufficient to account for the phenomena we have de- 
scribed, since many alternate changes of heat and cold must have 
taken place to have produced these alterations on the earth’s surface. 
Mr. W. D. Saull, F. G. S., is the only writer who has accounted 
for those changes in a satisfactory manner. This gentleman con- 
fines himself principally to the strata of England, in his illustra- 
tions ; but it will be seen, that they easily solve all the difficulties 
that Darwin alludes to respecting these changes in the American 
continents. 
[To be continued.] 
ON THE CONDITION OF THE HORSE— ITS CONNEXION 
WITH THE COAT— THE BEST MEANS OF PROMOTING 
HIS CONDITION— CLIPPING AND SINGEING. 
By Nimrod. 
Dear Sir, — FASTIDIOUS must be the reader interesting himself 
in the welfare of horses, who is not amused and instructed by Mr. 
Gabriel’s paper, in your last October Number, on the treatment of 
the horse in the autumn. Seeing that it has reference to my sys- 
