ZYGADENUS, OR DEATH CAMAS. 
27 
refer to this condition. It should be noted, however, that in the 
cases observed at the Grey cliff 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 
nightofJuly21. The 
respiration almost im- 
mediately after the 
dose was given ran 
up to 200 and during 
the afternoon varied 
between 60 and 168. 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, 
