Historical overview: Kraepelin's impact on psychiatry.

This paper reviews the importance Emil Kraepelin put on disease course as a classificatory principle. It then outlines the academic reception of Kraepelin's disease entities outside Germany, charts the uptake of his diagnostic concepts within clinical practice in Britain, and compares data on admissions for bipolar disorders, involutional melancholia and postpartum psychoses to the North Wales asylum during the period Kraepelin was working to data on contemporary admissions in an effort to shed further light on the validity of his diagnostic concepts.