ZYGADENUS, OR DEATH CAMAS. 



27 



refer to this condition. It should be noted, however, that in the 

 cases observed at the Greycliff station there was no indication of any 

 special tonic or clonic contraction of the muscles; the violent move- 

 ments of the animals were simply those caused by distress from 

 dyspnoea. 



Figure 3 gives the curve of respiration for sheep No. 174 and may 

 be considered typical of the average fatal case. The sheep was 

 drenched at 12 o'clock 

 noon and died at 1 1 . 1 5 

 p.m. The respiratory 

 rate rose to 200 be- 

 tween 2 and 3 o'clock, 

 when the animal had 

 one of the spasmodic 

 struggles for breath. 

 It then fell to 9 and 

 remained low, with 

 comparatively slight 

 variations, until the 

 time of death. 



Figure 4 gives the 

 curve of respiration 

 of sheep No. 160, a 

 prolonged case. This 

 animal was drenched 

 with Zygadenus at 

 11.25 a. m., July 19, 

 and died during the 

 night of July 21. The 

 respiration almost im- 

 mediately after the 

 dose was given ran 

 up to 200 and during 

 the afternoon varied 



between 60 and IfiS Fig. 3.— Curve of respiration of sheep No. 174. 



In the evening it fell, and after that time the maximum noticed was 

 68, but most of the time it was near 20 or 30. 



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MUSCULAR WEAKNESS. 



In all cases of any severity muscular weakness was noticeable. 

 Early in the illness the animals staggered, and in the more serious 

 cases not only could not rise, but lay flat upon the ground. This 

 weakness was most pronounced in the forelegs. Plate V, figure 1, 

 shows this condition of weakness in the forelegs in sheep No. 162, 

 while Plate V, figure 2, shows the same animal down. Plate VI, 



