The treatment of cancer of the tongue is of vital importance to the medical profession, because of its frequency and virulent character. Some authorities place it next in frequency to cancer of the uterus, and others assign it to third and fourth place. While the disease occurs most frequently in men, it is not uncommon in women. A point that should be emphasized is that the disease does occur in the second and third decade, and great care should be taken not to be influenced too much by the apparent youth of the patient. It would seem that the disease is becoming more frequent in younger persons, and while more accurate diagnosis is undoubtedly being made, this certainly cannot account for the increase noted in younger persons.
There is probably no disease in which the causative factor and the precancerous lesions are more important, because of the serious nature of