The Bulletin 
39 
TABLE VI —Results of Transmission of the Disease Through the Milk from Ewes 
to Lambs. Experiment 22. 
Animal No. 
Feed given. 
Ewe 
Lamb 
Initial 
Experiment 
Date of 1 
No. days on 
Weight 
Gain or 
Grain. 
Kale. 
No. 
No. 
weight. 
begun 
death. \ 
experiment. 
at death. 
loss. 
Lbs. 
Lbs. 
Lbs. 
Lbs. 
Lbs. 
171 
244 
38 
May 13 
June 17 
35 
27.5 
—10.5 
9 
33 
162 
243 
50 
May 13 
July 25* 
73 
61 
11 
30 
71 
175 
242 
40 
May 13 
June 17 
35 
39 
—1 
15 
32 
167 
241 
33 
May 13 
July 25* 
73 
32 
—15 
36 
71 
12 
237 
46 
May 13 
July 25* 
73 
56 
10 
35 
71 
168 
200 
48 
May 13 
July 15* 
83 
45 
—3 
35 
60 
*These lambs were put on pasture on the dates indicated. 
Two lambs, Nos. 244 and 242, developed genuine cases of milksick- 
ness and died thirty-five days after tlie experiment was begun, June 17. 
Ewe 171, tbe mother of lamb 244, showed no evidence of trembles until 
a few days before her death, which occurred, as noted before, on Au¬ 
gust 30. These individuals are shown in Eig. G, at a time when the 
lamb had passed into a state of coma. The mother of lamb 244 never 
manifested any evidence of trembles although she was continued on the 
experiment until September 2. This fact accords with the observation 
which has previously been made by Jordan and Harris (1909) that 
animals can transmit the disease through the milk without themselves 
ever manifesting any signs of the disorder. 
Lambs 237 and 241 were employed after this experiment was con¬ 
cluded in tests on the toxicity of expressed sap as has been reported in 
Experiment 21. The other two lambs, Nos. 243 and 200, were placed 
on pasture. 
The butter from cows affected with trembles is also generally believed 
to be the source of milksickness. A number of publications dealing 
with this phase of the subject have appeared in which the authors, among 
whom are Johnson (1866), Gray (1881), Beach (1883), Scott (1889), 
Beck (1905), and Jordan and Harris (1909), commit themselves to this 
belief. The last named writers describe an outbreak which came under 
their observation at Morris, Ill., in 1908. Five cases developed in a 
family which secured butter from a farm six miles distant. The cows* 
which gave the milk from which this butter was made, ranged in wood¬ 
land in which eight cattle had contracted trembles two years earlier. 
About a month after the recovery of these five persons, a typical case 
appeared in one of the young men on the farm from which the butter 
had been procured. In concluding this account, they state that “There 
seems little doubt, therefore, in view of all the facts, that butter brought 
from the ‘milksick’ farm was responsible for the cases.” 
