204 Air. 



scarcely be admitted into stables too freely, provided it does not 

 enter in partial cuyrents^ and blow upon a Horse in that mode. And 

 therefore I consider the common ventilators, which are made upon 

 the principle of a smoke-jack, and are fixed in windows, to be per- 

 fectly futile and almost entirely useless. If the situation of the win- 

 dows be such as to admit the air freely without the objections which 

 have been pointed out, the upper part of the sash may be constructed 

 so as to draw doAvn with a line and pulley ; but if the windows be 

 too low to obtain fresh air, except in currents which will be directed 

 "partially, I would recommend that air-holes should be opened at least 

 ten feet from the ground in such stables as are lofty enoug-h to admit 

 of it, and that they should be placed behind rather than before the 

 stalls. 



By means of a flap or shutter these apertures might be contrived 

 so as to admit more or less air according to circumstances, but ex- 

 cept ^during very intense frosts it would not be advisable to close them 

 altogether. 



The size and number of such air-holes must, of course, vary ac- 

 cording to the size and loftiness of stables, and the number of Horsei 

 which are kept in them. Their dimensions should not be less than 

 two square feet, and one such might be sufficient for a stable that 

 does not contain more than two Horses. 



In no particular is the Horse apt to suffer greater ill effects from 

 the influence of hot and foul air, than with respect to his eyes. 



Nor will this opinion be matter of surprise to any one who has an 

 opportunity of comparing the number of diseased eyes which are 

 ftund amongst Horses that are kept in hot confined «tables^ with th« 



