The material for this paper was obtained by using the Rorschach test. Purely as an introduction to this paper it may be said that the test differentiates individuals according to their preference for perceptions of form, colour and movement. This separation into categories is obtained by the exhibition to the patients of ink-blots of different colours and shapes. For details of the technique the best source of reference is Rorschach's Psychodiagnostik, though no English translation of the original German is available in print. For those unfamiliar with the test the articles of P. E. Vernon, McCalman, and the present author may be found useful.