PLANTS POISONOUS TO STOCK. 225 



sold for feeding, represents the principal source of this form of 

 poisoning. 



The symptoms are very vague. There is indigestion, with a ten- 

 dency to nausea, and vomiting. Diarrhoea may he present : At a later 

 stage the heart and nervous system are affected. The gait becomes hesi- 

 tatmg, the animals show general dulness and spasm of the pharynx; 

 death, when occurring, is by cardiac or respiratory syncope. 



Treatment consists in giving an entire change of food, and adminis- 

 tering stimulants and purgatives. 



AGAEICACEJj; (MUSHROOM FAMILY). 



Amanita muscaria.— The well-known fly amanita (fly fungus ; deadly 

 amanita) may he found from spring to early ^^'inter in pine forests 

 throughout the United States. Cows are supposed to be killed by eating 

 it, and almost every year the daily papers chronicle the death of several 

 human beings who were led to eat the fungus through mistake for some 

 edible species. The fresh cap is frequently rubbed up with milk and 

 used to poison flies. 



PHALLACE.'E (STINK-HOKN FAMILY). 



*Clathrus columnatus. — In an article published in the Botaiti<<d 

 (jdzctte (Vol. XV. p. 45), Dr. Farlow, of Harvard University, gives an 

 account of an investigation of a case of poisoning in hogs which was 

 caused by eating this peculiar fungus. It grows in patches in oak woods 

 and openings, and is quite common throughout the Southern States. 



POLYPODIACE^E (fBKN FAMILY). 



Pteris aquilina. — In July, 1895, nineteen cattle died in Maryland, 

 which were supposed to have been poisoned by eating the common 

 bracken fern. Very few similar cases are on record, but one European 

 authority cites one in which five horses were killed by eating hay con- 

 taminated with this fern, and another states that cases are quite frequent 

 among cattle in England. 



■'b 



EQUISETACE.T3 (hORSETAIL FAMILy). 



Equisetum arvense. — The field horsetail was reported from Con- 

 necticut in 1871 as being poisonous to horses. Cases are very rare, and 

 it is pro])able that this plant is deleterious only when eaten in consider- 

 able quantity, and then perhaps only on account of its physical character. 

 Experiments made in Europe show that a similar species {E. iKilustvc) is 

 fatal to horses when fed in considerable quantity with hay. 



D.c. Q 



