Similarly, if every patient who had taken more than a pound of bismuth to relieve gastric pain were routinely explored to see that cancer or gastric ulcer did not exist, the large majority of growths in this region would be either prevented or cured. Similar rules can easily be devised to deal with cancers arising in other parts. What is wanted is a change of attitude on the part of everyone concerned. After all, a fortnight in bed, with forty-eight hours of discomfort, is not too great a price to pay for freedom from this disease, and, with proper examination, even this would be unnecessary in most cases. Every intelligent person is aware that, in order to ensure freedom from dental disease, it is necessary to have his teeth examined every six months, and to have small lesions dealt with in their very early stages. All have come to this conclusion because they know that neglected dental disease means pain; and they now look to see that their teeth are normal, instead of waiting for a toothache to come. It is true that there are still some of our weaker brethren who still wait till they get toothache before they visit the dentist; and for them there is nothing to be done. In the same way, if we wait for the advanced signs of cancer to develop, the position with regard to its cure will remain approximately what it is to-day. The education of the public up to this pitch is by no means an impracticable proposal. The position with regard to appendicitis is very much the same as that of cancer. What has been done in the case of appendicitis? The mortality is in proportion to the number of hours during which the disease has existed. Twenty years ago appendicitis was responsible for a large number of deaths. During 1919 and 1920 there was, in a large London General Hospital, only one death from appendicitis, and yet there were at least 5 cases dealt with every week. This improvement is entirely the result of education of the public and their doctors. They know that to be cured operation must be early, and so we no longer wait to see whether the patient is going to die; if we suspect it, we look and see whether it is present or not. True, we remove unnecessarily a fair number of appendixes but, by so doing, we purchase, for a much larger number of people, immunity from death by this disease. When exactly the same principle is applied to cancer we shall be in a position to be a great deal more satisfied than we are at present.