. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences. RUDIMENTS. 17 viously consists of the extreme margin of the ear folded inward; and this folding appears to be in some manner connected with the whole external ear being permanently pressed backward. In many monkeys, which do not stand high in the order, as baboons and some species of Macacus,* the upper portion of the ear is slightly pointed, and th( margin is not at all folded inward ; but if the margin were to
. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences. RUDIMENTS. 17 viously consists of the extreme margin of the ear folded inward; and this folding appears to be in some manner connected with the whole external ear being permanently pressed backward. In many monkeys, which do not stand high in the order, as baboons and some species of Macacus,* the upper portion of the ear is slightly pointed, and th( margin is not at all folded inward ; but if the margin were to be thus folded, a slight point would necessarily project inward toward the center, and probably a little outward from the plane of the ear; and this I believe to be their origin in many cases. On the other hand. Prof. L. Meyer, in an able paper recently publiisiied,! maintains that the whole case is one of mere variability; and that the projections are not real ones, but are due to the internal cartilage on each side of the points not having been fully developed. I am quite ready to admit that this is the correct explanation in many in- stances, as in those figured by Prof. Meyer, in which there are several minute points, or the whole margin is sinuous. I have myself seen, through the kindness of Dr. L. Down, the ear of a microcephalous idiot, on which there is a projection on the outside of the helix, and not on the inward folded edge, so that this point can have no relation to a former apex of the ear. Nevertheless in some cases, my original view, that the points are vestiges of the tip8 of formerly erect and pointed ears, still seems to me probable. I think so from the frequency of their occurrence, and from the general correspondence in position with that of the tip of a pointed ear. In one case, of which a photograph has been sent me, the projection is so large, that supposing, in ac- cordance with Prof. Meyer^s view, the ear to be made per- See also some remarks, and the
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear
