26 BULLETIN 125, U. S. DEPARTMENT OF AGRICULTURE. 
RESPIRATION. 
The rate of respiration had an extremely wide range of variation. 
Quite uniformly in the acute stages of the poisoning, the rate was 
very rapid, running in some cases as high as 250 per minute. After 
this period the rate was very much reduced, falling to normal or below, 
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Fig. 1.— Curve of temperature of sheep No. 282. 
and the animal sometimes lay for hours breathing most of the time 
in a slow and labored fashion. This period of comparative quiet might 
be interrupted, sometimes frequently, by times of rapid breathing, 
accompanied by panting and followed quickly by a very slow rate. 
Sometimes, in severe cases, there were times when the animal threw 
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Fig. 2.— Curve of temperature of sheep No. 291 
itself about violently, fighting for oxygen. This condition lasted for 
perhaps two or three minutes and was succeeded by a period of quiet, 
which was soon broken by another struggle. During these struggles 
the mucous membranes of. the mouth were frequently cyanotic. 
The struggles were spasmodic, and when authors state that poisoned 
animals have spasms or convulsions, it is to be presumed that they 
