Kirby[285] is of the opinion that Dreyfus based some of his findings on insufficient evidence, as shown by his published case records:—"In a considerable number of other cases the author's conclusion that manic-depressive symptoms were present is based on extremely meagre data. As an illustration one case may be referred to briefly. A man fifty-three years old had an agitated depression lasting over two and one-half years and terminating in recovery. The case record contains no statement of any objective inhibition or feeling of subjective insufficiency, neither are there any statements regarding flight of ideas, or unusual loquacity. The diagnosis, however, is made of manic-depressive insanity, with partial psychomotor inhibition and flight of ideas. The assumption that these symptoms existed is based entirely on the retrospective account from the patient, obtained three years after recovery from the psychosis. He then declared that during the attack he could not think calmly; it seemed that one thought "knocked the other down," one thought "hunted after the other." He also described a feeling as if there were a cap on his head, as if he were nailed down. These retrospective statements are interpreted to mean that there was partial psychomotor inhibition and flight of ideas. In many other cases the reasoning is just as forced and the deductions based on equally insufficient grounds.... The author's aim was to see if the symptoms present fitted into certain schematic formula and thus the analysis became rather a search for diagnostic signs supposed to characterize a definite form of disease. Such a method leads away from consideration of the mental disorder as a whole; a few minor features are emphasized in the picture and because the patient recovers these are raised to diagnostic importance—a little feeling of insufficiency or a slight change of mood in a disorder which ends in recovery are seized upon as evidence that a special kind of disease exists; as a matter of fact, we would hardly miss just such symptoms in many other psychoses. There is no attempt to get below the surface, to understand the evolution of the disorder, or to use the facts in the development in formulating the prognosis."