It should be added, however, that this result cannot at present be generalized, since in the hermaphrodites the specific hormones of both sexes must circulate without suppressing each other’s efficiency. All these facts indicate that certain substances secreted by the ovaries or testes may inhibit the development of certain sexual characters of the opposite sex. When these inhibitions are partly or entirely removed the secondary sexual characters of the opposite sex may appear. This fact may also be interpreted as an indication of a latent hermaphroditism and if this be correct the real and latent hermaphrodites differ only by the degree of inhibition for one sex, this inhibition being lacking or less complete in the real than in the latent hermaphrodite. In the light of this conclusion the observations on the regeneration of both ovaries and testicles which Janda observed in a hermaphroditic worm, _Criodrilus lacuum_,[194] is no longer so mysterious. This worm normally possesses in the segments near the head a pair of ovaries and several pairs of testes. Janda found that if the anterior parts containing the gonads of these worms are cut off a complete regeneration takes place, including both types of gonads, ovaries as well as testes. As a rule, more than one pair of ovaries appear in the regenerated piece. This important experiment shows that in a hermaphrodite both types of sex organs can be produced from body cells or from latent buds resembling body cells. This phenomenon would be intelligible on the assumption that in the body of a hermaphrodite substances circulate which favour the development of both types of sex organs, while in a diœcian animal probably only one type of sex organ would be developed; the formation of the other being inhibited. [194] Janda, V., _Arch. f. Entwcklngsmech._, 1912, xxxiii., 345; xxxiv., 557. Richard Goldschmidt has discovered in his breeding experiments on the gipsy-moth (_Lymantria dispar_) a phenomenon which will probably throw much light on the physiology of sex determination. He found that certain crosses between the Japanese and the European gipsy-moth do not give pure sexes, males or females, but mixtures of the sexual characters of both sexes, and this mixture is a very definite one for definite crosses. These differences are such that it is possible to grade the hybrids according to their manifestations of maleness or femaleness, both in morphological characters and instincts. Goldschmidt calls this peculiar phenomenon intersexualism, and its essential feature is that the various degrees of intersexualism can be produced at will by the right combination of races.