THOSE whose duty it is to deal with the" poor teaching cases" in the medical out-patient depart-ments of the great London hospitals soon find that most of their patients fall into a few large but not very clear-cut groups. First come the menopausal osteo-arthritics, with or without hypertension and early signs of congestive failure. Then there are the chronic bronchitics and patients with long-standing indigestion, in whom no definite lesions, beyond a few rhonchi or a little tenderness, can be discovered. Finally, there are the great concourse of neurotics, some well hospitalised and saturated with the not very efficacious mixtures intended for their more organic friends, others, less regular visitors as a rule, scarcely to be distinguished from early cases of