LARKSPUR POISONING OF LIVE STOCK. 
67 
figures indicate the number of the animal in each case. The letter S 
indicates that the animal was fed seeds, and the letter L that leaves 
were used. 
At first glance these charts do not seem to be very instructive. It 
will be seen that the quantities of Delphinium barbeyi necessary to 
J( //v£ JUL Y * AUG (/ST *^-S£PT£WffER^- 
30 S /0 /S 20 2S 30 4 9 /4 /9 24 29 3 8 /3 /S 
/90 
/80 
/70 
/60 
/SO 
J40 
\/30 
\*° 
K //o 
S/oo 
%* 
% 80 
60 
50 
40 
30 
20 
€04 
4? 
608 
% 
//2 
/07 
■X 
- 
% 
c ■ 
r 
6VSA 
<9 
97 
fiP 
s 
603 
-£ 
-5 
r 
602 
-* 
//7 
s 
/06 
L 
92 
<H?& 
? 
% L 
60SC 
Fig. 6. — Chart of feeding of Delphinium barbeyi to cattle experimentally poisoned in 
1909, showing dates, quantities fed, and duration of feeding. © indicates plant 
collected near station ; X indicates plant collected at Kebler Pass about 1,000 feet 
higher than the station ; those marked L received leaves and stems ; those marked 
8 received seeds and the pods and stems bearing them ; all the others received the 
whole top of the plant. The short horizontal line indicates duration of feeding. 
The weights of plant are given per thousand pounds of animal. 
produce poisoning in 1909 varied from 30 pounds in the case of No. 
92 to 188 in the case of No. 604. In 1910 the quantities varied 
from 30.4 pounds in the case of No. 98 to 280.8 pounds in the case 
of No. 625, while with the Delphinium menziesii the quantities varied 
from 62.2 pounds in the case of No. 113 to 116.5 pounds in the case of 
No. 82. In 1911 only Delphinium barbeyi was fed and the quantity 
necessary to produce poisoning varied from 34.7 pounds in the case 
