58 BTTLLETIX 365, U. S. DEPARTMENT OF AGBICTJLTUBE. 
perience but apparently, if anything, benefited by the opportunity 
of free pasturing. During the summer the band of sheep was cor- 
ralled nights in a small pasture which during the month of June was 
almost entirely covered with Delphinium menziesii. All of this plant 
was eaten out with the other plants growing in the pasture and 
no injurious effect was produced upon any of the sheep. 
These experiments, in conjunction with the corral feeding experi- 
ments, seemed to the station force to prove conclusively that sheep 
can eat Delphinium bar-bey i and Delphinium menziesii with im- 
punity, and that no fear of poisoning need be entertained from 
pasturing sheep on a range containing these plants. 
EXPERIMENTAL FEEDING OF DELPHINIUM ANDERSONII TO SHEEP TN 1911. 
Inasmuch as the belief is very common among the sheepmen of 
California and Oregon that sheep are poisoned by eating the roots of 
Delphinium andersonii, two experiments were made of feeding the 
roots of this plant. The material was collected at McDowell's 
Creek, near Lakeview, Oreg., on June 24, 1911, and forwarded to the 
station at Mount Carbon. As it is somewhat difficult to make sheep 
eat the roots of the plant, and as the quantity was limited, it was 
decided to administer the material in the form of a drench. The 
roots after being washed were ground fine and mixed with enough 
water to permit of their administration. Two animals were used. 
Sheep 155, weighing 131 pounds, was brought in for experiment 
on August 9. At 11.30 a. m. on August 11 it was given 200 grams 
of dried roots and on August 12 at 11 a. m. and 2.30 p. m. it was 
given the same amount. It thus received 1.3 pounds of the roots. 
Inasmuch as these had been air .dried it would be equivalent to at 
least twice that amount of fresh roots. 
Sheep 136, weighing 153 pounds, was brought in for feeding on 
August 13. At 10.30 a. m. on August 14 it was given 200 grains of 
the roots. The same quantity was administered at 2.20 p. m., 1.15 
p. m., and 7.45 p. m., and 150 grams were given at 9.45 p. m. Thus, 
this animal received between 10.30 a. m. and 9.45 p. m. 2.1 pounds 
of dried roots. This would be equivalent to at least 4.2 pounds of 
fresh material. It is highly improbable that the sheep upon the 
range, grazing upon larkspur, would obtain anything like this 
amount of larkspur roots, so that this experiment in conjunction 
with the experimental work of feeding roots of other larkspurs at 
Mount Carbon seems to be fairly conclusive that sheep are not 
poisoned by eating roots of Delphinium andersonii. Table X gives 
the results of this experimental feeding. 
