PRINCIPLES OF VENTILATION. IX 
“The proper supply,” the author says, “of fresh air is as 
necessary to the health of the inferior animals as it undoubtedly 
isto man. Baneful as is the influence of impure air on the 
constitution of human beings exposed to its influence, it is 
no less so to the valuable animals, the horse and the cow. 
Many are the diseases which affect our domestic animals 
that are brought on by exposure to foul air, and many a 
valuable animal is sacrificed to a close and ill-ventilated 
stable.” 
In the same work Dr. Southwood Smith is quoted :— 
“Nor is there one,” says the Doctor, “among the many 
questions thus forced upon the attention of every civilised 
community, which is itself so important, or the correct solution 
of which is so indispensable to the preservation of health, as 
the investigation and subject-means for providing in every 
space occupied by human beings a gradual but constant 
change of air.” 
These quotations testify to the absolute necessity for both 
man and the lower animals of air in sufficient quantities, 
and to the evils of withholding it. The suggestions they 
contain cannot be too highly commended to the study of all 
who have anything to do with the care and management 
of horses. 
Nor are these my sole authorities. I can refer for con- 
firmation of my conclusions—for I can hardly call that theory, 
which has been demonstrated by practice—to a work on 
stable management and ventilation which I think one of 
great merit :— 
“The principle of ventilation,” says the writer, “ has 
been till lately but ill understood. If we thoroughly venti- 
late, we run the risk of increasing the cold atmosphere of 
the stable below the requisite heat. Not that heat should 
