So confident have surgeons and pathologists become of this that a score of instances are on record where physicians and pathologists, among them the famous surgeon-pathologist, Senn, of Chicago, only a few years ago, have voluntarily ingrafted portions of cancerous tissue from patients into their own arms, with absolutely no resulting growth. In fact, the cancer-cell behaves like every other cell of the normal body, in that, though portions of it can be grafted into appropriate places in the bodies of other human beings and live for a period of days, or even months, they ultimately are completely absorbed and disappear. The only apparent exception is the epithelium of the skin, which can be used in grafting or skinning over a wide raw surface in another individual. However, even here the probability appears to be that the taking root of the foreign cells is only temporary, and makes a preliminary covering or protection for the surface until the patient's own skin-cells can multiply fast and far enough to take its place. A similarly reassuring result has been obtained in animals. Not a single authenticated case is on record of the transference of a human cancer to one of the lower animals; and of all the thousands and thousands of experiments that have been made in attempting to transfer cancers from one animal to another, only one variety of tumor with the microscopic appearance of cancer--the so-called Jensen's tumor of mice--has yet been found which can be transferred from one animal to another. So we may absolutely disabuse our minds of the fear which some of our enthusiastic believers in the parasitic theory of cancer have done much to foster, that there is any danger of cancer "spreading," like an infectious disease. Disastrous and gruesome as are the conditions produced by this disease, they are absolutely free from danger to those living with or caring for the unfortunate victim. In the hundreds of thousands of cases of cancers which have been treated, in private practice, in general hospitals, and in hospitals devoted exclusively to their care, not a single case is on record of the transference of the disease to a husband, wife, or child, nurse or medical attendant. So that the cancer problem, like the Kingdom of Heaven, is within us.