. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 1-iO SEXUAL SELECTION: BIRDS. [Part II. spot (b), with its bright shading, there is a long, narrow, black mark (c), belonging to the same row, and which is arclied ;i 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 A B c. Fig. 58.—Portion of one of the Secondary winj-fenthera near to the bodr ; show ing the so-called
. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 1-iO SEXUAL SELECTION: BIRDS. [Part II. spot (b), with its bright shading, there is a long, narrow, black mark (c), belonging to the same row, and which is arclied ;i 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 A B c. Fig. 58.—Portion of one of the Secondary winj-fenthera near to the bodr ; show ing the so-called elliptic ornaments. The ri.;ht-hand flgiire is eiven merely as a diagram for the sake of the letters of reference. A, B, C, etc. Rows of spots ruii'iincr down to and formin;; the elliptic ornaments. b. Lowest spot or mark in row B. c. The next sncceeding spot or mark in the same row. d. Apparently a broken prolonsrsition of the spot c in the same row B. always more or less distinct from it, there is another black mark (d). 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: ., bookcentury1800, bookdecade1870, booksubj, booksubjecthumanbeings
