§2 



VBTlJRlNAEt HYGIENE 



outlet ; the direction of the air-current through an opening 

 depends on the direction of the wind. It is desirable, 



Fi". 23. — Transverse section of stable. Two horses are placed between 

 opposite windows, heads to outer walls. The arrows indicate the 

 direction of the wind. 



however, to work on the principle of inlets in the wall and 

 outlets in the roof. 



Fig. 24. — Transverse section of stable. Eight horses are placed between 

 opiiosite windows, with their heads to dividing walls. The arrows 

 indicate the direction of the wind. 



6. Tubes or shafts either as inlets or outlets are generally 

 to be avoided. 



Mechanical Ventilation. 



This may be defined as the method by which air is 

 extracted from or propelled into buildings by means of 

 pumps or fans. It obviously is not a system to employ 



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