Ko. 4.] 



STABLE VENTILATIOX. 



125 



but not essential. The animals should be arranged in rows 

 on either side, facing a central drive or passageway (Fig. 7). 

 There should be four rows of valves, two below (one on 

 either side in rear of the animals) , situated four or five feet 

 from the floor, and two above near the plates, or, better, in 

 the sides of the monitor roof, provided the building is con- 

 structed on that plan. The lower row of valves, on the 

 windward side of the l)uilding, should be open to admit fresh 

 air; those above, on the opposite side, to allow for the 

 escape of the foul air. By having numerous valves, each of 



Fiu. 10. — CroBS-Bection of stable, with manni-e sheds, showing inlet for fresh 

 air under the driveway floor, and direction taken by the incoming 

 currents of air. 



which is opened but a little, the incoming current of air is 

 evenly distributed throughout the building, and objectionable 

 draughts prevented. 



Another plan of construction particularly applicable to 

 stables with straight walls, with manure sheds on either 

 side, i)rovides for the introduction of fresh air through open- 

 ings in the manger fronts, and the escape of foul air through 

 windows or cupola openings above. This system of inlets 

 is onlv used to good advantage in those barns where the 



