44 



VETERINAEY HYGIENE 



in which moulds as contrasted with bacteria were found 

 in different atmospheres; they ascertained that bacteria 

 predominate while moulds become fewer as the respira- 

 tory impurity increases. This is shown in the following 

 table : — 



These observers determined that the maximum number 

 of micro-organisms in inhabited rooms should not exceed 

 560 per cubic foot of air. 



DISEASES PKODUOED BY IMPUEE AIE. 



The foundation of Veterinary Hygiene was laid at the 

 close of the 18th century, by a consideration of the diseases 

 produced by impure air. One of the chief pioneers in the 

 matter was Professor Coleman of the London Veterinary 

 College, and the position he occupied in the world of science 

 was such that attention was paid to his outcry. 



He held the view that glanders could be produced in 

 previously healthy horses, by exposing them to the vitiated 

 air of a stable. In those days fresh air was considered not 

 only unnecessary but pernicious, and every attempt was 

 made to rigidly exclude it from stables, even the keyhole 

 not being forgotten. 



Coleman's view of the cause of glanders cannot be 

 accepted in the present day, but whatever the patholo- 

 gist may teach regarding micro-organisms, nothing can 

 displace the fact that there are conditions of the body 



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