Cases of pure apraxia in which the perception of space remains unaffected, in which even the 'intellectual notion of the gesture to be made' does not appear to be obscured, and yet in which the patient cannot copy a triangle; cases of constructive apraxia, in which the subject shows no gnosic disturbance except as regards the localization of stimuion his body, and yet is incapable of copying a cross, a or an, all prove that the body has its world and that objects or space may be present to our knowledge but not to our body.