102 Plants which cause Mechanical Injury [CH. vm 
in lambs and sheep when eaten in large quantities (48), and has caused 
the death of many a lamb. It would appear to be due entirely to the 
formation of large lumps of the weed in the stomach, and subsequent 
fermentation (Farmer and Stockbreeder, Mar. 16, 1908). 
According to Cornevin, Black Bindweed (P. Convolvulus L.) may 
prove injurious, owing to the occurrence of the hard, trigonous, and 
pointed "seeds" in cereal grains. Galtier published facts which show 
that oats which contain too many of the "seeds" may, by prolonged 
use, occasion a more or less serious enteritis, which is sometimes fatal, 
particularly when the grain is fed to greedy horses which scarcely grind 
their food (73). The fruits or "seeds" of Knot-weed (Polygonum 
Aviculare L.) may similarly prove injurious, and probably the seeds 
of other plants. 
