No. 4.] 



STABLE VENTILATION. 



119 



The openings into the building should be provided with 

 close-fitting doors. The solid excrement may be removed 

 by means of a litter carrier or barrow, the liquid, carried in 

 drains or gutters. If the manure is stored in sheds located 

 upon the sides of the stable, and connected with it by means 

 of wall scuttles, these must be tightly fitted and kept closed 

 except when in use. They should never be opened for the 



Fig. 2. — CroBs-section, showing a ventilating shaft with too many angles. 



admission of air, particularly when manure is piled below 

 them outside. 



Let us consider a few things in regard to the different 

 forms of inlets and outlets which arc frequently seen in use. 

 The inlet and the outlet most commonly met with is the 

 shaft or duct, usually constructed of wood in rural districts ; 

 in cities, of galvanized sheet-iron or tin. They may be of 

 either material, round or square, located in the walls of the 

 building or independently of them. In their construction 



