These hysterical anæsthesiæ, it may be added here, may be not only very definite but very profound. Just as the reality,--though also the impermanence,--of the hysterical retrenchment of field of vision of which I have been speaking can be shown by optical experiments beyond the patient's comprehension, so the reality of some profound organic hysterical insensibilities is sometimes shown by the progress of independent disease. A certain patient feels no hunger or thirst: this indifference might be simulated for a time, but her ignorance of severe inflammation of the bladder is easily recognisable as real. Throw her into hypnosis and her sensibilities return. The disease is for the first time felt, and the patient screams with pain. This result well illustrates one main effect of hypnosis, viz., to bring the organism into a more normal state. The deep organic anæsthesia of this patient was dangerously abnormal; the missing sensibility had first to be restored, although it might be desirable afterwards to remove the painful elements in that sensibility again, under, so to say, a wiser and deeper control. What has been said of hysterical defects of sensation might be repeated for motor defects. There, too, the powers of which the supraliminal self has lost control continue to act in obedience to subliminal promptings. The hysteric who squeezes the dynamometer like a weak child can exert great muscular force under the influence of emotion. Very numerous are the cases which might be cited to give a notion of dissolutive hysterical processes, as now observed with closer insight than formerly, in certain great hospitals. But, nevertheless, these hospital observations do not exhaust what has recently been learnt of hysteria. Dealing almost exclusively with a certain class of patients, they leave almost untouched another group, smaller, indeed, but equally instructive for our study.