404 
Journal of Agricultural Research 
Vd. IX, No. ii 
ageratoides were fed during the months of June, July, August, September, 
and October, 1916. 
(2) Fifteen cases of trembles in sheep have been developed from feed¬ 
ing E. ageratoides . Fourteen of these resulted fatally, and one of them 
recovered. Death of one of these sheep was probably due in part to an 
infestation of stomach worms. 
(3) Death resulted in from 5 to 27 days following the beginning of 
feeding of E. ageratoides . 
(4) Considerable variation existed in the several ewes, also, with refer¬ 
ence to the quantity of weed ingested before trembles appeared. 
(5) Indirect evidence against the infectious nature of the disease was 
secured by failure to communicate trembles from sheep characteristically 
affected to healthy sheep when they were confined and fed together in a 
small lot. 
(6) Salt and soda in the amounts given along with a ration of grain 
and E. ageratoides were without apparent antidotal effect. 
(7) No harmful effect followed the feeding for 69 days of aluminium 
phosphate mixed with grain and supplemented with alfalfa hay. 
literature cited 
Crawford, A. C. 
1908. The supposed relationship of white snakeroot to milksickness, or “trembles.” 
In U. S. Dept. Agr. Bur. Plant Indus. Bui. 121, p. 5-20, pi. 1. 
Jordan, E. O., and Harris, N. M. 
1908. The cause of milksickness or trembles. In Jour. Amer. Med. Assoc., v. 50, 
no. 21, p. 1665-1673. 
1909. Milksickness. In Jour, Infect. Diseases, v. 6, no. 4, p. 401-491, 6 fig. Bibli¬ 
ography, p. 485-491. 
Moseley, E. L. 
1906. The causes of trembles in cattle, sheep and horses and of milksickness in 
people. In Ohio Nat., v. 6, no. 4, p. 463-470; no. 5, p. 477-483. 
1909. The cause of trembles and milksickness. In Med. Rec. [N. Y.], v. 75, no. 
20, p. 839-844- 
1910. Antidote for aluminium phosphate, the poison that causes milksickness. In 
Med. Rec. [N. Y.], v. 77, no. 15, p. 619-622. 
