Da a een ES a 
. DISEASES OF THE HORSE. 151 
bing, swelling, pain, heat and disorder of function, with 
change in both’ its fluid and solid constituents, as well 
as with more or less general disturbance of the system.” 
The extent to which structures in a state of inflammation 
will swell, varies considerably, depending upon the vital 
and physical characters of the tissues involved. Muscu- 
far tissue becomes very much swollen, while, on the other 
hand, horny and cartilaginous tissues swell but little, in 
consequence of their low state of vitality. It must be 
remembered that it requires an assemblage of the above 
conditions to constitute inflammation. Swelling,, pain, 
heat, or redness alone do not constitute that condition, 
as either may occur from causes independent of any in- 
flammatory action whatever. 
We now feel prepared to proceed with our remarks 
upon the various diseases with which the horse is afilict- 
ed, with a better understanding reparding the interest 
of our readers, than we would have done had we passed 
-this subject by unnoticed. 
Capillaries.—The blood is the ‘pabulum from whence 
is elaborated the entire organism, as well as the source 
from whence are derived all the various secretions and ex- 
cretions of the system; but in order that these purposes 
may be accomplished, it is necessary for the fluid in 
question to be circulated through, or its materials 
brought in contact with, every tissue requiring fresh nu- 
trition, as well as through the various secretory and 
excretory organs. To effectually accomplish this, we 
‘find a class of structures set apart and admirably adapt- 
ed in every way to fulfill the purposes required. The 
first of these is the heart itself; next come the large 
blood conduits, the arteries, which spring from the former, 
as the tree springs from. the earth; while the arteries, 
again, terminate in a series of vessels of wonderful 
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