Read it through once

The Tares sown amongst the wheat were probably the seed of the Darnel. When growing, this grass is very like wheat, and it would be quite possible to mistake one for the other until the flowers and fruit are formed. Darnel is one of the very few poisonous grasses. It is said that the poison is produced by a fungus which is found in the grain. When darnel seed is ground up with wheat the bread becomes dangerous, for the poison produces severe headache, vertigo, and giddiness. Other authorities say that it causes in man and rabbits eruptions, fits of trembling, and confusion of sight. It seems not to affect horned cattle, swine, and ducks.