We need a detailed examination of the various forms of expression art has differentiated into, in its relation to exhibitionism and as effects of the circulating libido-producing substance of the gonads. Sex exhibition differs in man and woman because of the differently combined internal secretions that are their substrates. The male's attitude, aggressive pursuit, is instigated by the compound adrenal and gonad endocrines. The female's various emulsions of coyness and display are motivated by posterior pituitary and gonad hormones in alliance. It is a dogma to state that the internal secretions of sex do not begin to function until after puberty. Some children manifest exhibitionism with a certain independence of environment. Before adolescence a good many girls act like tom-boys, and are distinguishable externally from boys only by their clothes. But others display signs of sex differentiation that are to be traced back to an awakening interstitial gonad action. Some boys have no interest whatever in sex. Others will show an intense curiosity spontaneously, a curiosity which perhaps may be explained as a larval precocity, dependent upon the minimum of sex hormone production by the gonads. Close observation of the correlation of somatic and psychic development in extreme examples of these children corroborates this view. Jonathan Hutchinson has described full-busted children of London already boasting of their affairs. Indeed, as education and environment affect the body (in so far as they influence it as a whole) by exciting or inhibiting the glands of internal secretion, sex-arousing stimuli from without must be considered to evoke their effects as stimulants of the latent puberty glands.