THE DISEASES OF CATTLE. G5 



to be reduced, and finally suspended altogether. If on the 

 contrary the animal grows worse it should be slaughtered and 

 buried. 



ON VENTILATION. 



Pare air is one of the forces of nature, ifi constant operation, 

 to preserve the integrity of animal life ; therefore, impure air 

 must necessarily occasion various forms of disease. 



In the course of fourteen years' practice, the author of this 

 work has had ample opportunities of investigating the causes 

 of disease, and has satisfied himself, beyond a reasonable doubt, 

 that a very great proportion of the diseases occurring among 

 live stock, owe their origin, either directly or indirectly, to a 

 vitiated atmosphere ; and that other maladies, having various 

 origins, are aggravated, and restoration is often tardy, sometimes 

 impossible, in consequence of the morbid action of impure air. 



The author's intention, in offering the following article, is lo 

 benefit both the superior and inferior orders of creation ; hence 

 the attention of the reader is craved to some matters which do 

 not directly apply to cattle, yet may prove of great value to 

 owners of the same. A pure atmosphere is the " breath of 

 life." 



The science of ventilation has never received that attention 

 which its importance to the well-being of man, and the welfare 

 of the inferior orders of creation demands ; in fact, everybody 

 professes to be somewhat acquainted with the wants of the ani- 

 mal economy, as regards food, fluids, rest, and exercise, yet, in 

 reference to the necessary amount of aerial food, — the breath 

 of life, — very few persons ever give the subject more than a 

 passing thought. A pure and uncontaminated atmosphere is 

 absolutely necessary for physiological respiration ; any devia- 

 tion from purity (whether the man or animal be diseased or 

 not), is sure, sooner or later, to end in ill health. A cow, or, 

 indeed, any other animal, can survive the deprivation of both 

 food and water for many days, without incurring any thing like 

 the same amount of danger encountered when breathing, for a 

 6* 



