POISONOUS PROPERTIES OF THE WHORLED MILKWEED. 3 



The plant material used was collected in Yuma County, Colo. — a 

 part of it in the town of Wray. The material was dried, but in the 

 experimental work was estimated as green plant, 72 per cent being 

 allowed for loss of weight in drying. 



The following table is a summarized account of the experiments, 

 22 in number : 



Table 1. — Summary of feeding experiments with Asclepias pumila (air-dried 

 plant fed with balling gun). 



Anim 



al. 



Date of 







Designa- 

 tion. 



Weight. 



feeding. 





Pounds. 



1919. 



Sheep 532.. 



98 



July 23 



Sheep 514. . 



135 



July 25 



Sheep 539. . 



99 



July 26 



Sheep 547. . 



89.5 



July 28 



Sheep 546. . 



100 



July 29 



Sheep 482. . 



122.5 



Aug. 1 



Sheep 486. . 



135 



Aug. 5 



Sheep 530. . 



95 



Aug. 8 



Sheep 536. . 



114 



Aug. 11 



Sheep 539. . 



104 



Aug. 15 



Sheep 552. . 



94.5 



Aug. 18 



Sheep 516. . 



81.5 



Aug. 24 



Sheep 547.. 



95.5 



Aug. 29 



Sheep 554. . 



104.5 



Sept. 2 



Sheep 546. . 



101.5 



Sept. 6 



Sheep 512. . 



124.5 



Sept. 11 



Sheep 520. . 



102 



Sept. 15 



Sheep 539. . 



105. 75 



Sept. 17 



Sheep 516. . 



80.75 



Sept. 19 



Sheep 542. . 



111.5 



Sept. 23 



Sheep 519. . 



85 



Sept. 25 



Sheep 547. . 



99 



Sept. 27 





Weight 





of plant 





(esti- 





mated 



Part of plant 



as green 



used. 



plant) 





for 100 





pounds 





of 





animal. 





Pounds. 



Leaves and 



0.150 



stems. 





do 



.197 



do 



.295 



do 



.402 



do 



.787 



do 



.787 



do 



.827 



do 



.866 



do 



.866 



do 



.905 



do 



.984 



do 



.984 



do 



1.063 



do 



1.181 



do 



1.339 



do 



1.496 



do 



1.693 



do 



.787 



do 



1.850 



do 



1.968 



do 



2.165 



do 



2.559 



Remedy 

 used. 



Place and date of 

 plant collection. 



None. 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



....do 



Esenn and 



pilocar- 



pin. 

 None 



...do 



...do 



...do 



...do 



...do 



...do 



...do 



...do 



Not sick . 



do 



do 



do 



Symptoms . . . 



Sick...".".*.'..'." 

 Symptoms. .. 

 Somewhat sick 

 Symptoms 



Sick 



....do 



do 



....do 



....do 



Symptoms. 



Sick 



Symptoms . 



Sick 



....do 



Died 



....do 



Wray, Colo., July 5, 

 1919. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Yuma County, Colo., 

 Aug. 12, 1919. 



Do. 



Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 





TYPICAL CASE OF SHEEP 547. 



Sheep 547 was a ewe which had been used for other experimental 

 work earlier in the season, but was in good condition when on July 

 28, 1919, she was selected for feeding with Asclepias pumila. At 

 that time she weighed 84 pounds. At 3.10 p. m., 0.402 pound green 

 weight of the plant per 100 pounds of animal was given by the ball- 

 ing gun. This produced no effect. 



On August 29, at 6.04 p. m., the sheep was given, by the balling 

 gun, 1.063 pounds of plant, green weight, per 100 pounds of animal. 

 At this time she weighed 95.5 pounds. On August 30, at 7.25 a. m., 

 the pulse was 112 and weak, the respiration 12, rather deep, with 

 somewhat forcible expirations. She was humped up, with the head 

 held high, and showed weakness in the hind legs. Later in the day 



