458 
GEO. El. BERNS. 
ers’ horses, and nineteen years’ connection with J. H. B. Co.’s 
stables of about ninety head of brewers’ horses, not a single 
case of osteo-porosis has presented itself in any one of these 
stables during all these years ; and I conld enumerate twentv- 
five or thirty more first-class stables in Brooklyn in which from 
five to twenty-five horses are kept and no osteo-porosis has ever 
developed. 
During the last seven or eight years in all cases of osteo¬ 
porosis which developed in small and badly drained stables, I 
have had the floors ripped np, the soil under floors removed to 
the depth of several feet, new clean soil or coal cinders substi¬ 
tuted, new sleepers and floors put down, stables ventilated, ma¬ 
nure pits closed up and placed outside of buildings, etc., with 
extremely gratifying results. In stables so renovated in which 
two or three horses had developed big head successively in 
three or four years, no more cases have appeared since these 
simple sanitary measures were established. 
Again, I have never seen a case of osteo-porosis recover if 
it was kept in the same stable in which it had developed the 
disease ; but send him away to pasture or to another stable in a 
distant locality, there is, according to my experience during 
the last eight years, at least a chance for a good serviceable re¬ 
covery. 
Some of our best authorities and most careful observers and 
investigators, as Friedburger and Frohner, of Germany, W. F. 
Williams and Faville, of this country, and several others, regard 
osteo-porosis as identical with rachitis and osteo-malacia in its 
pathological anatomy and perhaps justly so; but as both of 
these conditions are supposed to be caused by defective assimila¬ 
tion or a lack of food containing lime in sufficient quantity, I 
cannot understand how a bone which has been fully and regu¬ 
larly developed in a colt, remaining in a perfectly healthy con¬ 
dition after the animal is fully matured for a number of years, 
should become enlarged to two or three times its normal size, 
as is frequently the case with the rhami of the lower jaws and 
facial bones in osteo-porosis, by simply a want of earthy material 
