. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. SEXUAL SELECTION : BIRDS. [Part II. spot (ft), with its bright shading, there is a long, narrow, black mark (c), belonging to the same row, and which is arched a little downward so as to face (b). It is also narrowly edged on the lower side with a fulvous tint. To the left of and above c, in the same oblique direction, but. Fig. 58.—Portion of one of the Secondary wing-feathers near to the hody ; phow ing the so-called elliptic or
. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. SEXUAL SELECTION : BIRDS. [Part II. spot (ft), with its bright shading, there is a long, narrow, black mark (c), belonging to the same row, and which is arched a little downward so as to face (b). It is also narrowly edged on the lower side with a fulvous tint. To the left of and above c, in the same oblique direction, but. Fig. 58.—Portion of one of the Secondary wing-feathers near to the hody ; phow ing the so-called elliptic ornaments. The right-hand figure is given merely as a diagram for the sake of the letters of reference. A, B, C, etc. Rows of spots running c. The next succeeding spot or mark down to and forming the elliptic in the same row. ornaments. d. Apparently a hrokcn prolongation b. Lowest spot or mark in row B. of the spot c in the same row B. always more or less distinct from it, there is another black mark (fl). This mark is generally sub-triangular and ir- regular in shape, but in the one lettered in the diagram is unusually narrow, elongated, and regular. It apparently consists of a lateral and broken prolongation of the mark (c), as I infer from traces of similar prolongations from the succeeding upper spots ; but I do not feel sure of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Charles, 1809-1882. New York: D. Appleton and Company
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Keywords: ., bookcentury1900, booksubjectevolutionbio, booksubjecthumanbeings
