The author describes under this heading a group of cases in which the mental disturbance is always associated with subjective psychical facts. He divides his thirteen cases into three groups. In the first, some illness has directed special attention to the organ afterwards believed to be diseased. In the second, the individuals thought they had heart disease, after having seen cases of it in others. In the third, the psychical trauma was caused by some marked agency as death of friends or parents. The symptoms were mild depression, confusion, and ideas that some organ was diseased. These cases come on in apparently healthy individuals and heredity is generally absent. They differ from hysteria in the absence of any objective phenomena and from phases of pathophobia in being unattended by any signs of degeneracy. The author considers that they arise from the impression absorbing in a morbid way the attention of the subject, and producing the beginning of an association of ideas.