THE INDUCTION OF NARCOSIS IN HORSES. 
339 
and one-half drachms for every two hundred and twenty 
pounds; this narcosis lasted about twenty minutes. In foals 
from one to two years old, three and three-quarters to five 
drachms were sufficient in eight minutes to effect the narco¬ 
sis ; the shortest space of time this lasted, was in one case 
eight minutes, one nine minutes and two ten minutes. A 
four-year-old gelding was narcotized in seven minutes by 
one ounce of chloroform. In twelve cases of the one hundred 
and twenty-six, one-half hour was necessary ; in four cases 
from thirty to forty minutes were requisite to induce the nar¬ 
cosis. With stallions this appeared in eighteen minutes, with 
mares in nineteen minutes and with geldings in twenty-two 
minutes: further, the stallions needed three and one-third 
ounces, mares three and and one-quarter ounces and geldings 
three ounces of chloroform respectively. In seven cases, 
(three stallions, two mares, two geldings) the effect was in¬ 
duced by one and one half ounces, and opposite to this, 
eighteen cases, (five stallions, four mares, nine geldings) re¬ 
quired over four and one-half ounces. In one gelding seven 
and one-hall ounces were used, and in one English thorough¬ 
bred seven and two-fifths ounces. The average age of the 
stallions was five, the mares nine, and the geldings seven 
years. 
It was noticed that the quantity of the chloroform needed 
depended upon the method of applying. (There was no es¬ 
sential difference between the English and German chloro¬ 
form). Less chloroform was used when slowly administered 
and when mixed with warm air, than when rapidly given ; 
the quantity of this agent used can be said to stand in in¬ 
verse proportion to the length of time occupied before the 
desired influence is brought about. The race of the patient 
exercised little, if any influence upon the quantity used or 
the time necessary to produce unconsciousness; but geldings 
consumed more than stallions or mares. 
In twenty-eight cases, seven and one-half grains of mor¬ 
phine were injected previous to the inhalation, and in these 
three ounces and fifteen minutes were consumed in securing 
narcosis. Also in eight cases, the latter was produced by a 
