140 Stable Management. 



not only defects in ventilation, but serious disease 

 in the animals. 



The small amount of pure air thus obtained, 

 frequently proves as injurious in another way as 

 the foul air within, thus establishing the dogma of 

 the couplet 



" If cold winds reach you through a hole, 

 Go make your will, arid mind your soul." 



The plan, then, which has succeeded, was to 

 arrest the back current and ensure a constant 

 discharge in one direction only, while a fresh 

 supply is received in an opposite part of the 

 building. 



Where ventilating bricks occur, a piece of thin 

 leather was nailed to the top of the frame, on the 

 outside, so as to form a kind of valve, the lower end 

 hanging loose and floating. In long ventilating 

 shafts which were formerly open at the bottom, 

 a short tube of three-fourths size is made, about 

 a foot long, the top being closed, and the sides 

 perforated by holes bored with an inch and half 

 centre- bit. 



The holes are protected on the outside by means 

 of a flap of thin leather nailed at the top edge to 

 form a hinge, and the whole is then fitted inside 

 the original shaft, but in such a manner as to 

 be moveable at will. All cold currents are pre- 

 vented from entering downwards, as they imme- 

 diately close the leather valves, which are very 

 light and sensitive. 



