I have the detailed history of a man of 30, of high ability in a scientific direction, who, except during periods of mental strain, has practiced masturbation nightly (though seldom more than once a night) from early childhood, without any traceable evil results, so far as his general health and energy are concerned. In another case, a schoolteacher, age 30, a hard worker and accomplished musician, has masturbated every night, sometimes more than once a night, ever since he was at school, without, so far as he knows, any bad results; he has never had connection with a woman, and seldom touches wine or tobacco. Curschmann knew a young and able author who, from the age of 11 had masturbated excessively, but who retained physical and mental freshness. It would be very easy to refer to other examples, and I may remark that, as regards the histories recorded in various volumes of these _Studies_, a notable proportion of those in which excessive masturbation is admitted, are of persons of eminent and recognized ability. It is often possible to trace the precise mechanism of the relationship between auto-erotic excitement and intellectual activity. Brown-Séquard, in old age, considered that to induce a certain amount of sexual excitement, not proceeding to emission, was an aid to mental work. Raymond and Janet knew a man considering himself a poet, who, in order to attain the excitation necessary to compose his ideal verses, would write with one hand while with the other he caressed his penis, though not to the extent of producing ejaculation.[344] We must not believe, however, that this is by any means the method of workers who deserve to be accepted seriously; it would be felt, to say the least, as unworthy. It is indeed a method that would only appeal to a person of feeble or failing mental power. What more usually happens is that the auto-erotic excitement develops, _pari passu_ and spontaneously, with the mental activity and at the climax of the latter the auto-erotic excitement also culminates, almost or even quite spontaneously, in an explosion of detumescence which relieves the mental tension. I am acquainted with such cases in both young men and women of intellectual ability, and they probably occur much more frequently than we usually suspect.