The author offers a concise clinical manual for medical students and practitioners that presents psychiatry as part of internal medicine while emphasizing its distinct clinical methods. The first section explains definitions, causes, pathological anatomy, sensory and cognitive disturbances, examination, prognosis, prevention, treatment, legal issues, and nosology. The second section surveys specific conditions: exhaustion and acute confusional states, infection- and intoxication-related psychoses (including alcohol- and drug-related disorders), neurotic and traumatic disorders, hysteria, epilepsy, chorea, borderline states and compulsive conditions, degenerative disorders such as paranoia, manic-depressive illness and dementia praecox, and organic psychoses including paresis, cerebrovascular and senile dementias. Practical diagnostic guidance and therapeutic approaches are stressed throughout.