WESTERN SNEEZEWEED AS A POISONOUS PLANT. 



31 



a daily dosage of 1.G8 pounds per hundredweight of animal. This, 

 it will be seen, does not differ materially from the average obtained 

 for sheep, so that the inference is a reasonable one that H. Jioopesii is 

 about equally poisonous to sheep and cattle. 



ACUTE CASES. 



Table 6 gives a summary of the animals to which the green plant 

 was given by forced feeding in one day in order to produce acute cases. 



Table 6. 



-Summary of forced feedings of green leaves in one day which produced 

 intoxication. 



Animal. 



Number of 

 feedings. 



Quantity 

 fed per 

 hundred- 

 weight of 

 animal. 



Time from 



end of 

 feeding to 

 symptoms. 



Result. 



Sheep 315 . 

 Sheep 332. 

 Sheep 340 . 



Sheep 393 . 



Sheep 424 . 

 Sheep 432 . 

 Sheep 428. 

 Sheep 444 . 



1916. 

 1917. 



Sheep 461 . 



1918. 



Pounds. 

 2.646 

 2.846 

 2.645 



2.306 

 2.501 

 2.299 

 2.217 



2. 835 



Hours. 



C 1 ) 



6i 



8i 

 5| 

 24 



311 



Sick. 

 Do. 

 Do. 



Very sick. 

 Sick. 



Symptoms. 

 Do. 



Pick. 



Average. 



1 Immediate effect. 



The average dosage in the table above was 2.494 pounds, with a 

 minimum limit of 2.217 pounds and a maximum of 2.846 pounds. In 

 general it may be stated that 2.5 pounds of green leaves fed in one 

 day may produce intoxication. It should be noticed, however, that 

 none of these feedings resulted in death. Reference to Table 1 will 

 show that — 



Sheep 320 received 2.79 pounds without effect. 

 Sheep 318 received 2.646 pounds without effect. 

 Sheep 347 received 2.756 pounds without effect. 

 Sheep 479 received 2.473 pounds without effect. 



It is recognized that there is some difficulty in noting slight 

 symptoms and that some of these animals may have been affected by 

 the plant, although no positive symptoms appeared. It is fair, 

 however, to draw the inference that while 2.5 pounds may be con- 

 sidered as the toxic dose of the green plant in acute cases, it does not 

 follow that all animals receiving this quantity in a single day will be 

 poisoned. 



