H. M. aged twenty-seven years, male, Canadian. Family history good; looked pale, anemic, and frail; very intelligent, sensitive, restless, and had a tendency to worry. About a year ago, he began to feel depressed, to worry about his health; thought he suffered from tuberculosis. His physician assured him that nothing was the matter, but he had an uncontrollable fear of consumption; and the idea kept on recurring. Up to the age of nineteen years he was perfectly well. He was then laid up with a sore knee for a few weeks. He had time enough to brood over the knee, and read some literature on the subject. He thought it was tuberculosis and worried much. The knee, however, got well, and gradually he forgot all about it, although the idea of tuberculosis often made him feel uncomfortable, and the idea of “water in the knee” used to flash through his mind, to pass away the next moment. A year ago, however, he happened to lose his work, became despondent, began to worry and to brood over his financial troubles, slept restlessly, suffered from anorexia, and began to lose flesh. The idea of the knee and the fear of tuberculosis got possession of him. He could not rid himself of the idea of tuberculosis. If in the clinic the physician assured him that he was all right, he felt better for a couple of hours; but often it did not last even as long as that. The least pain, cough, heart beat, a feeling of chill or heat, and the like, brought the idea and fear of tuberculosis back to his mind with renewed energy. He was obsessed by the fear of tuberculosis and felt he was doomed to certain death, a psychosomatic pathophobia. Hypnoidal states did good service. The patient’s mental condition began to improve rapidly. He was no longer troubled with depression, insomnia, and fears; began to gain in weight, appetite improved, felt energy flowing in; began to look for work in real earnest, finally found it, and kept at it. Man, aged forty-three years, suffered from palpitation of the heart, fainted easily, especially on physical examination by physician, or at the beginning of medical treatment. He suffered from indigestion for which he had been under treatment for a number of years by physicians who gave him medicine for his bowels and also from time to time kept on washing his stomach. He had a great fear of becoming a victim of cardiac troubles, especially of some unknown, terrible, valvular affection. When under my care he kept on asking to be taken to heart and stomach specialists, to be examined, and have some radical operation performed. Frequently under the influence of the fear states and obsession of heart and stomach trouble, especially the heart, he would collapse suddenly, be unable to walk, and be afraid that he suffered from some paralysis.