WESTERN SNEEZEWEED AS A POISONOUS PLANT. 25 



Depression. — The first symptom noted in the corral cases is de- 

 pression. In very mild cases this may be the only symptom noted, 

 and probably in most range cases is overlooked. This is shown in 

 the attitude of Sheep 314. (PL I, fig. 5.) 



Pulse. — In most cases the pulse is weak, irregular, and somewhat 

 rapid. Of these characteristics the irregularity is most noticeable, 

 and in mild cases this and depression may be the only symptoms 

 noted. Of course in range cases this is never recognized. 



Weakness. — Accompanying the depression and weak and irregular 

 pulse is a general weakness, which is more pronounced in the pro- 

 longed cases. This is shown in Sheep 374 (PL II, fig. 1 ) and still more 

 clearly in Sheep 421 (PL I, figs. 1, 2, 3, 4, 5, and-6). In some of the 

 acute cases this weakness does not appear at all. 



Restlessness. — Both in the early and later stages of the sickness, the 

 animals generally exhibit marked restlessness. If they are strong 

 enough to stand on their feet they will remain standing but a short 

 time, when they will lie down and then very soon get up again and 

 move about in an uneasy way. 



Stiffness. — During the sickness a peculiar stiffness in gait fre- 

 quently is noticed. This accompanies the weakness, though it is 

 not a result simply of weakness, and may be considered somewhat 

 characteristic of the intermediate stages. 



Teinperature. — There are no marked changes in the temperature, 

 and it remains practically normal during the period of illness. 



Respiration. — The respiration is quickened when the animal at- 

 tempts to get up on its feet, and is also more rapid during the acute 

 stages of the sickness. There are no peculiarities of respiration which 

 can be considered as characteristic of H. hoopesii poisoning. 



Salivation. — Salivation occurred in many of the force-fed animals 

 and in some of those poisoned by prolonged feeding. 'In some cases 

 the salivation resulted in profuse frothing at the mouth. Doubtless 

 this was due in some measure to mechanical irritation caused by the 

 method of forced feeding, but this was not the complete explana- 

 tion; salivation may be considered as a common symptom in the 

 forced-feeding cases and as a symptom which occasionally occurs in 

 chronic cases. Sheep 358 (PL II, fig. 2) is a good example of a salivated 

 animal. 



Nausea.— Nausea was exhibited in many of the animals; it did not 

 however, always result in vomiting. In some of the acute cases vomit- 

 ing did not take place, although it did in some of those in which re- 

 peated forced feeding were made. Generally speaking, in the pro- 

 longed cases vomiting, or " spewing," as it is called by the sheepmen, 

 is the most prominent symptom of H. hoopesii poisoning. In range 

 animals it is practically the only symptom which is noticed by the 



