34 AMERICAN STABLE GUIDE. 



entering into the stall through the ceiling. Thus it will 

 be seen that when one of these ventilating shafts is in 

 place, a constant current is. kept up between it and the 

 registers below. This ventilator is of wood, made like a 

 square funnel, carried up through the hay-loft or upper 

 portion of the stable and the roof to the outside, and to pre- 

 vent a down draught of air, snow, or rain, a " cowl,'^ some- 

 times called an " archimedian ventilator," turning with the 

 wind, is placed on top of the end of the shaft. For this 

 purpose, one made of wood, and covered with sheet tin or 

 zinc, like the pattern here represented, will answer all pur- 



Head of Shaft. 



poses. It will be readily recognised from its shape, so 

 often seen in many parts of the country upon the roofs of 

 buildings. 



In a badly-ventilated stable, in the fall or spring of the 

 year, its inmates will be fevered and sick. Coughs, colds, 

 lung fever, scratches, grease, influenza, farcy, glanders, 

 and other zymotic afi'ections, are some of the concomi- 

 tants of impure air in ill-ventilated places. Pure air is so 

 indispensable to animal life, that a high condition of health 



