_Indo-European_.--Hair long (accel.); jaws orthognathous (embryonic retard.); nose (generally) prominent with bridge (accel.); malar bones reduced (retard.); beard long (accel.); arms shorter (retard.); extensor muscles of the leg large (accel.). The Indo-European race is then the highest by virtue of the acceleration of growth in the development of the muscles by which the body is maintained in the erect position (extensors of the leg), and in those important elements of beauty, a well-developed nose and beard. It is also superior in these points in which it is more embryonic than the other races, viz., the want of prominence of the jaws and cheekbones, since these are associated with a greater predominance of the cerebral part of the skull, increased size of cerebral hemispheres, and greater intellectual power. A comparison between the two sexes of the Indo-Europeans expresses their physical and mental relations in a definite way. I select the sexes of the most civilized races, since it is in these, according to Broca and Topinard, that the sex characters are most pronounced. They may be contrasted as follows. The numbers are those of the list already used. I first consider those which are used in the tables of embryonic, quadrumanous, and race characters: MALE. FEMALE. I. _The General Form_. 2. Shoulders square. Shoulders slope. 4. Waist less constricted. Waist more constricted. 5. Hips narrower. Hips wider. 6. Legs longer. Legs shorter (very frequently). 8. Muscles larger. Muscles smaller. II. _The Integuments, etc_. 10. More hair on body, that Less hair on body, that of head of head shorter; beard. longer; no beard. 12. Skin rougher (generally). Skin smoother. III. _The Head and Face_. 16. Superciliary ridges more Superciliary ridges low. prominent. 22. Eyes often smaller. Eyes often larger. [Illustration: The Wrestler; original in the Vatican. This figure displays the characters of the male Indo-European, except the beard.] The characters in which the male is the most like the infant are two, viz., the narrow hips and short hair. Those in which the female is most embryonic are five, viz., the shorter legs, smaller muscles, absence of beard, low superciliary ridges, and frequently larger eyes. To these may be added two others not mentioned in the above lists; these are 1, the high pitched voice, which never falls an octave, as does that of the male; and 2, the structure of the generative organs, which in all mammalia more nearly resemble the embryo and the lower vertebrata in the female than in the male. Nevertheless, as Bischoff has pointed out, one of the most important distinctions between man and the apes is to be found in the external reproductive organs of the female.