Our senses supplement one another. A slow education has gradually taught us to co-ordinate their impressions, especially those of touch to those of vision. (H. Bergson, "Note on the Psychological Origins of Our Belief in the Law of Causality". Vol. i. of the "Library of the International Philosophical Congress", 1900.) Theoretical forms come between nature and us: a veil of symbols envelops reality; thus, finally, we no longer see things themselves, we are content to read the labels on them. Moreover, our perception appears to analysis completely saturated with memories, and that in view of our practical insertion in the present. I will not come back to this point which has been so lucidly explained by Mr Bergson in a lecture on "Dream" ("Report of the International Psychological Institute", May 1901.) and an article on "Intellectual Effort", ("Philosophical Review", January 1902.) the reading of which cannot be too strongly recommended as an introduction to the first chapter of "Matter and Memory", in which further arguments are to be found. I will only add one remark, following Mr Bergson, as always: perception is not simply contemplation, but consciousness of an original visual emotion combined with a complete group of actions in embryo, gestures in outline, and the graze of movement within, by which we prepare to grasp the object, describe its lines, test its functions, sound it, move it, and handle it in a thousand ways. (This is attested by the facts of apraxia or psychic blindness. Cf. "Matter and Memory", chapter ii.)