Page:Seton-Thompson--Wild animals I Have Known.djvu/321

 enormously, they one and all grew thinner and thinner. The mother was the last to be affected. But when it came, it came as hard on her—a ravenous hunger, a feverish headache, and a wasting weakness. She never knew the cause. She could not know that the dust of the much-used dust-bath, that her true instinct taught her to mistrust at first, and now again to shun, was sown with parasitic worms, and that all of the family were infested.

No natural impulse is without a purpose. The mother-birds knowledge of healing was only to follow natural impulse. The eager, feverish craving for something, she knew not what, led her to eat, or try, everything that looked eatable and to seek the coolest woods. And there she found a deadly sumac laden with its poison fruit.

A month ago she would have passed it by, but now she tried the unattractive berries. The acrid burning juice seemed to answer some strange demand of her body; she ate and ate, and all her family joined in the strange feast of physic. No human doctor could have hit it better; it proved a biting, drastic purge, the dreadful secret foe was downed, the danger