716 
REVIEW. 
measures which the laws of science alone point out. It is 
true that an acquaintance with these calls for a knowledge of 
the principles of hygiene and natural philosophy, and that to 
a greater extent, perhaps, than has yet been thought neces¬ 
sary ; but it is the inculcation of this knowledge that will be 
sure to make the veterinary surgeon a more highly educated 
man, and consequently one more earnestly sought for by the 
public. Need we add that, especially is that division of 
natural philosophy, designated chemistry, brought into requi¬ 
sition here? Thus although we know nothing of the nature 
of malaria, the fruitful source of so many diseases, beyond 
its being the result of changes induced in organic matter by 
the conjoint agency of heat and moisture ; yet we do know 
that when animals are congregated together, chemical changes 
occur in the atmosphere they breathe, to which must be 
added the pernicious compounds that result from the decom¬ 
position of their excreta, and which being inhaled, give rise 
to affections of the lungs, skin, and other organs, through an 
empoisoned state of the blood being induced by the absorp¬ 
tion of these mephitic emanations. To guard against 
this, ventilation is demanded. Now how could this be effec¬ 
tually accomplished, or proper means be devised for the 
purpose, without some familiarity with aero-dynamic.s, and 
the laws that govern the diffusion of gases ? 
Respecting this, Mr. Haycock says— 
“In treating upon the ventilation of the Stable, it is taken for granted 
that every thinking person must he perfectly aware of the necessity for 
a regular and copious supply of pure air, for the maintenance of the 
health not only of ourselves, but of the lower animals also. This, al¬ 
though admitted as a fact, and not unfrequently theorized upon, is yet 
very far from being adopted in practice to the extent which might be 
anticipated. People continue to build dwelling houses for themselves, 
and stables for their horses, as though totally unconscious that those 
destined to live within them will require such a very necessary element 
as air. The capacity of the lungs of the horse is enormous. He requires 
a large amount of pure air to thoroughly purify the blood. Bad venti¬ 
lation is the cause of innumerable diseases ; and where it does not directly 
cause disease, if a diseased animal be subjected for any length of time to 
its deleterious influence, matters become worse, and serious aggravations 
of the malady result. Glanders, one of the most loathsome, infectious, 
and incurable forms of disease to which the horse is subject, very fre¬ 
quently arises from bad ventilation. Horses when on shipboard, have 
become glandered from simply shutting down the hatchways during the 
prevalence of a storm. Epidemic Catarrh, is another form of disease 
