While a Philadelphia clergyman was visiting a farmer in northern New Jersey, the family became perturbed because their dog had "gone mad." They fastened it in the kitchen and sought somebody to kill it by shooting at it through the window. A neighbor observed the dog carefully and told them it was poisoned. He advised the family to loose it in order that it might get some antidote for itself in field or forest. He told them that cats, cattle, and horses are often compelled to find an antidote for some poisonous herb they have eaten, and that the animals know more about such things than any teacher in the medical schools. As soon as the dog was unfastened he hastened across the field to a brook, and ate a weed that was growing beside the water. The dog soon returned to the house, and ate heartily after a two weeks' fast.
The clergyman had followed the dog and observed the plant which it had eaten. After the dog had returned to the house he uprooted the plant and took some of its leaves to a Philadelphia firm of chemists. Acting upon the firm's advice, he sent the leaves to the Smithsonian Institution at Washington, and they were found to be a valuable antidote for poison. Not only was humanity given a better medicine from this discovery, but the clergyman also derived a competency from it. This remedy for poisoning is often used in prescriptions; so even doctors sometimes "go to the dogs" for instructions.
Like Professor Agassiz and Sir Oliver Lodge, many find their best instructors in domestic animals. The fowls around the house and the barn may be whole universities for developing the sciences. Through her dependence on nature the hen is a more efficient instructor than the majority of college professors. She knows by instinct so much of the laws of nature that wise men may sit at her feet or her bill and learn. Perhaps she may seem a little foolish in proclaiming her achievements in egg-laying by a cackle, but her knowledge of the necessities of life, her careful oversight of her brood, the way she uses her feet and her wings, her foreknowledge of approaching storms, her means of defending herself when attacked by hawks, her knowledge of the formation of the egg and of the proper time to break the shell for the release of her chick--all these are worthy of the attention of even the greatest scientists.