Feb,, 1906.] 
The Cause of Trembles in Cattle. 
469 
viscera, including some liver, and might have eaten much more, 
if permitted. At 9 A. M. still trembled, but not so much; at 
10:45 could see no trembling; at 4 P. M. very little trembling 
vhen held up until after exercise when it was plain. Dec. 17, 
temperature at 9:10 A. M., 103°, at 3:30 P. M., 103.2°. Tremb- 
ling; at 9:10, none; at 10 o’clock, after considerable exercise, 
hind legs trembled and after drinking milk (she would take none 
with snake-root in it) , the hind legs and right front leg trembled 
strongly when she was held up; at 3:30 trembling mostly in left 
hind leg and that not till she had been held some seconds. She 
continued active and appetite good. Killed Dec. 17, but not 
examined until Dec. 26, when the only abnormal appearance 
was a general venous engorgement (likely due to the CS... which 
killed her?). The experiments with this cat proved that trem- 
bles could be produced by thoroughly boiled extract of snake- 
root. The later experiments showed that she would no longer 
take milk containing the poison but would take meat greedily, 
also that this meat brought on the trembling again, but her 
first experience appeared to have effected some degree of toler- 
ance of the poison, for she was not so strongly affected as a 
larger cat which ate a smaller quantity of meat from the same 
rabbit. This was 
No. 3. A female cat, weight about 3M pounds; was fed 
like No. 2 with meat from rabbit. No. 6. A hind leg was given 
at S A. M., Dec. 14, but at 3:40 P. M. had not been eaten. At 
7 :50 the next morning she had taken this and some good milk. 
A fore leg and side were x:>ut in, but had not been eaten at 10 
o’clock. At 4:10 P. M. the larger part had been eaten. No 
trembling that day.- At 5:50 P. M. left her half of liver. 
Of this piece about one-third remained the next morning and 
was giv'en to No. 2, which had eaten other half of liver. After 
being out of box a few minutes she returned voluntarilv. Then, 
for the first time I could feel trembling and on holding her up 
could see strong trembling of hind legs. 9 A. M., trembled 
some; at 10:45 did not tremble, had not eaten much of the meat 
left earlier, drank good cold milk and a few minutes later, when 
I held her up she trembled so that I could feel it and see it in her 
legs, three or four of them; 4 P. M., trembled some and, after a 
very little exercise, strongly. On putting her on window sill, 
3rd floor, and letting her look out, trembling was quite notice- 
able even without holding up. After being let free on the floor 
a little while trembling was very strong; apparently indisposed 
to exercise. When returned to box began eating rabbit. 
Dec. 17, 8:50 A. M., rabbit meat consumed except large 
intestine containing snake-root She seemed no worse; respira- 
tions 40 and 36 per minute, doubtless increased by fear; temper- 
ature at 9:45 A. M., 101^°; trembling that day no greater than 
