As a general rule, one sharp distinction is noticed between the religious and the non-religious healers, viz., the religious healer sees no limit to his healing power, and affirms that cancer and Bright's disease are as easily cured, in theory at least, as neuralgia or insomnia; the non-religious healer, sometimes designated as the "scientific healer," on the contrary, recognizes that there are some diseases which are more easily cured than others, and that of those others some are practically incurable by psycho-therapeutic methods. The line has been drawn in the past between functional and organic diseases, the former including diseases where there is simply a derangement of function, like indigestion, and the latter comprehending the diseases where the organ is affected, like ulcer of the stomach. The more we know about diseases the less sure we seem to be about their classification; some of which we were formerly sure have recently caused us considerable doubt. For example, we have formerly classed cancer as an organic disease and consequently incurable by mental means. The question is now asked, "Is cancer an organic disease, or is it some functional derangement of the epithelium tissue which causes it to grow indefinitely until it invades some vital organ?" A further question arises due to further study. Some of the latest investigators claim that most if not all persons have cancer at some time in life, but that anti-toxin or some other remedy is supplied by the body itself, and the growth is stopped and the tissue absorbed. The question then seems to be pertinent, "If the body can produce the cure within itself, and this would be functional, why cannot mental means stimulate the body to produce it?" or "Does not mental influence stimulate the body to produce it?" What the cancer experts tell us of the wide-spread extension of the disease and its spontaneous cure, the tuberculosis experts affirm of tuberculosis, and certainly of the latter disease spontaneous cures are not uncommon. We also know that mental influence may, in fact does, have an indirect but no less beneficial influence in the cure of tuberculosis. From these examples one seems to be forced to either one of two conclusions, either of which is contrary to generally accepted ideas, viz., first, that these are not organic diseases; or, second, organic diseases are aided or cured by means of mental healing. In general, however, the distinction holds good; the so-called functional cases are amenable to cure by mental means, and the organic are much less so.