PRINCIPALLY SOLANACEOUS AND COMPOSITOUS PLANTS 



I0 3 



Little is known about the poisonous principle in the plant, but it appar- 

 ently is found in largest amount in the flowers. The symptoms, as deter- 

 mined in Mississippi by an observation of calves, are an accelerated pulse, 

 difficult breathing, staggering and extreme sensitiveness to touch. Death 

 is preceded in fatal cases by spasms and convulsions. The spasms in 



FIG. 39. Flowering branch of white snakeroot (E upatorium urticcRfolium) . (After 

 Crawford, Albert C.: The Supposed Relationship of White Snakeroot to Milk Sickness, or 

 Trembles. Bull. 121, Part i, Bureau of Plant Industry, Plate i.) 



several cases with sheep are epileptiform, yet a sheep may have such 

 violent convulsions and yet recover without treatment, but they may 

 acquire a mania for it after having been poisoned. The horse and mule 

 succumb to the injurious effects of the toxic substance quicker and more 

 completely than other animals. The influence of the poison appears 



