128 
PROF. JAMES LAW. 
Belva. Taking the milk record of Belva as given in table 
VI ; we find that the milk yield in the twenty-four hours follow¬ 
ing the injection of the tuberculin shows no constant nor striking 
difference from that of intervening days. The highest yield per 
day (42.25 lbs) was on the fifth day succeeding the third injection 
of tuberculin, and on each of these five days the yield was from 
two to five pounds above the average. The lowest yield per day 
(31.5 lbs) was on the fourth day after the first injection, while the 
preceeding days yield had been over a pound above the average, 
and the two days following the injection had been respectively 
two and three pounds below. 
What is more significant is that the average yield of milk for 
the days following the seven injections of tuberculin is practically 
the same as the average yield for the whole forty-seven days in¬ 
cluded in the experiment. This may be stated clearly in tabular 
form thus: 
Average of the seven days following the injections of tuber¬ 
culin 37.257 lbs. Average of the forty-seven days for which 
the milk record is given 37.247 lbs. The difference is O.oi lb, 
and is in favor of the days when the system was charged with 
the dose of tuberculin. 
Daisy . The milk record of Daisy given in table VII, shows 
a great difference in the yield on different days, but no constant 
relation between the low daily yield and the days when the 
tuberculin was in the system. On the first, second, and fourth 
occasions in which the system was charged with the tuberculin 
the milk yield was above the average, whereas on the third, fifth, 
sixth and seventh occasions it was below. The highest daily 
yield (22.25 lbs) was on the day in the evening of which the first 
injection of tuberculin was made, and the second highest (21.25 
lbs), only ^ of a pound less was on the day after that injection. 
The lowest daily yield (15 lbs) was on the day when the last in¬ 
jection of tuberculin was in the system, and when besides the 
cow was in heat. This low yield was also reached on the day 
preceeding the second last tuberculin injection (the ninth day 
after an injection), and also on the succeeding day when the 
