STABLES. 149 



trap, to prevent tlie smell from tlie drain from 

 coming into tlie stable. I give a section of an 

 ordinary bell trap. It is kept in order by emptying 

 half a bucket of water down it (fig. 17). 



It will be seen at once that the edges of the 

 cup c being ander water, no smell can come from 

 pipe B into the stable through the grating a. 



We now come to the question of ventilating a 

 stable constructed so as to contain four or more 

 horses, and having only one entrance or door. The 

 main rules which I have given in describing how 

 loose boxes are best ventilated will also apply here, 

 namely, that the openings both for the admission of 

 fresh air and for the escape of the heated air should 

 be so contrived that the current of air should not 

 blow across the bodies of the horses, and that when 

 the stable door was opened, or even left open for some 

 time, it should not set up a draught of air across the 

 horses' backs. 



In order to guard against this, the openings 

 should be all on one side of the stables, that is, on 

 the same side as the door. 



If there is an opening at all at one of the ends, 

 it should be in that part of the end nearest the wall 

 which contains the other openings. 



The best place for the door to be in, is in the 

 middle of the wall behind the horses, so that the 

 gangway which runs along the foot of the stalls is 

 between the door and the horses. 



