The _presence or absence of a tumor_ is a very important aid to the diagnosis, though as I have already stated, not always reliable. Sometimes an ulcer may be covered with granulations, and its surroundings so infiltrated and hardened, that even post-mortem the naked eye can not tell whether it is cancer or simple ulcer, and the question has to be decided by microscope. Such are likely the cases which form the bases of cancer cures which are reported from time to time to have been effected by the use of various remedies. _Vomiting of blood_ is a symptom common to both cancer and ulcer of the stomach, but is usually more copious in the latter. If the absence of acid in the gastric juice of cancerous stomachs proves to be as reliable a symptom as has been recently asserted, this will be an important feature in the differentiation from ulcer. You will frequently be astonished by the success of your treatment if you think of ulcer in doubtful cases of stomach trouble, such as occurs in young girls with chlorosis and institute a strict milk diet with the measures adopted for the cure of ulcer. _Prognosis._ From what has been said you can see that in general the prognosis of ulcer of the stomach is good, that with proper avoidance of all irritation, the ulcer has a tendency to heal of itself. This tendency has been observed even in large ulcers, where death was perhaps the result of some intercurrent disease. Ulcers of the anterior wall of the stomach are more dangerous than such as occur on the posterior wall, for the reason that in the latter case adhesion with the neighboring structures are more easily formed, and thus fatal perforation prevented. The anterior wall takes a much more active part in the peristaltic movement of the stomach, and as a result does not enter so easily into adhesion with its surroundings. Even after an ulcer has healed it always remains a weak point, and cases of rupture of the stomach in old cicatrices are described by Chiari. _Treatment._ The pain is the most important criterion as a guide during the treatment. It is the signal by which I judge of the present condition of the ulcer. According to the variation of its character and intensity, I can judge whether the ulcer is healing, is remaining stationary, or is spreading and increasing in size or depth in spite of the treatment. If the pain has been removed permanently the ulcer has been healed. From the relation of this symptom to different kinds of food you can also judge of a progress or improvement of the ulcer.