' MEXICAN WHORLED MILKWEED AS A POISO^^OUS PLANT. 5 



Table 1. — Summary of feeding experiments v:ith Asclepias mexicana (air-dned plant fed 

 irith balling gun; no remedies used). 



Animal. 



Designation. | Weight. 



Date of 

 feeding. 



Sheep 582 



Pounds. 

 98 



Sheep 588 



93 



Sheep 595.... 



Sheep 603 



Sheep 607.... 



Sheep 610 



Sheep 563 



Sheep 579.... 

 Sheep 5S1 .... 



78 



97. 75 

 93 



81. 75 

 102. 5 

 86 

 75.5 



Sheep 584.... 

 Sheep .586 



82 

 128 



Sheep 595 



81 



Sheep 568 



86 



Sheep 575 



72.25 



Sheep 580 



69 



Sheep 590 



Sheep 595.... 



Sheep 602 



Sheep 603 



103. 5 



92 



93. 25 

 106.5 



1920. 

 June 21 



June 23 



June 28 

 July 1 

 July 6 



...do 



July 8 

 July 13 

 July 14 



July 16 

 July 20 



July 22 

 Aug. 10 

 Aug. 13 



Aug. 23 



Aug. 31 

 Sept. 3 

 Sept. 9 

 Sept. 13 



Part of plant u.sed. 



t Weight 

 I of plant 

 estimated 

 I as green 



plant 



i per 100 



jpoundsof 



animal. 



Result. 



Leaves 



....do 



....do 



....do 



Stems 



Leaves 



Stems 



....do 



....do 



....do 



....do 



....do 



Leaves, stems, and 



llowers. 

 Leaves, stems, and 



flowers. Large 



proportion of 



stems. 

 Leave-, stems, and 



flowers. 



....do 



....do 



Stems 



....do 



Pounds. 

 0.|176 



. 353 



.529 

 .705 

 .705 

 . 882 

 .882 

 1.058 

 L323 



1.411 

 1. 704 



1.481 

 .882 

 1. 0.58 



L235 



1.543 

 1. 323 

 2.205 

 3.527 



Not sick 



Sickness 



do 



do 



Not sick 



Death 



Not sick 



do 



Slight sickness . 



Not sick 



Slight sickness. 



Place and date of 

 plant collection. 



Not sick. 

 Sickness. 

 do... 



do... 



Death 



do 



SjTnptoms 



Possiblesymp- 

 toms. 



.Mount Diablo,Calif., 



fall of 1919. 

 Solano, Calif., fall of 

 1919. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Mount Diablo.Calif. 

 fall of 1919. 

 Do. 

 Mount Diablo and 

 Solano, Calif., fall 

 of 1919. 

 Solano. Calif., fall of 

 1919. 



Newman, Calif.. 

 July, 1920. 

 Do. 



Do. 



Do. 

 Do. 

 Do. 

 Do. 



TYPICAL CASE. SHEEP 610. 



vSheep 610 was a ewe weighing 81.75 pounds at the time of the exper- 

 iment. She had not been used in any other experimental work. To 

 this animal was given by the balling gun, between .5.07 and 5.15 p. m., 

 on July 6, 87.75 grams of dry Aficlepias mexicana leaves, an equivalent 

 of 0.882 pound of green plant per 100 pounds of animal. When 

 observed at 6.25 a. m. July 7 she was unsteady, staggering as she 

 walked about. At 7.20 a. m. the unsteadiness had increased in a 

 marked degree. At 8.59 a. m. her temperature was 105° F., pulse 

 152, respiration 36. When observed between 1.10 and 1.30 p. m. 

 she could move about without falling, but staggered, and when mov- 

 ing about went with a sidling gait, the weakness being most pro- 

 nounced in the hind legs. Plate II, figure 1, shows very clearly this 

 weakness in the hind legs. This condition continued during the after- 

 noon and evening. At 5.33 p. m. the temperature was 103, pulse 

 140, and respiration 44. 



On July 8 at 8.30 a. m. she aj)peared somewhat better than on the 

 preceding day. At 9.36 a. m. the temperature was 102.4, pulse 120, 



