Professor L. Landois, in his work on “Human Physiology,” says that “when a _hydra_ is divided into two parts, each part forms a new individual—nay, if the body of the animal be divided into several parts in a particular way, each part gives rise to a new individual. The _planarians_ also show a great capacity for producing lost parts. Spiders and crabs can reproduce lost feelers, limbs, and claws; snails, part of the head, feelers, and eyes, provided the central nervous system is not injured. Many fishes reproduce fins, even the tail fin. Salamanders and lizards can produce an entire tail, including bones, muscles, and even the posterior part of the spinal cord, while the triton reproduces an amputated limb, the lower jaw, and an eye. This reproduction requires that a small stump be left, while total extirpation of the parts prevents reproduction. In amphibians and reptiles the regeneration of organs and tissues, as a whole, takes place after the type of embryonic development, which is by cell division, and the same is true as regards the histological processes which occur in the regenerated tail and other parts of the body of the earth worm.” Comparative pathological anatomy clearly demonstrates the inherent curative power of nature, and this is also apparent in the vegetable kingdom, and together they deliver a lecture on the “art of healing” from the stage of creation, in silent and modest language, but eloquently instructive to the thoughtful observer. The question now naturally arises How far this curative energy of nature operates in warm-blooded animals, and especially in man? The answer must be that, while it falls short of reproducing parts of organs or even tissues in the same degree of perfection as in the lower orders, the innate tendency towards regeneration and recovery from injury and disease is, on certain lines, practically the same. There is not the slightest doubt that ninety per cent. of all cures, whether the invalid took this, that, or the other medicine, or whether the method of treatment was homeopathic, allopathic, or mind cure, are entirely due to this inherent curative energy; and the other ten per cent. may have required some active remedy, but this, too, alone, without nature’s healing force, would have been ineffectual.