. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CHAP. XIV. J OCELLI. ¥illi and large ocelli (B^")."^ In cases like these, the development of a perfect ocellus does not require a long course of variation and selection. With biids and many other animals, it seems to follow from the comparison of allied species that circular spots are often generated by the breaking up and contraction of stripes. In the Tragopan pheasant faint white lines in the female represent the beautiful white spots in the male j ^^ and something of the.
. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CHAP. XIV. J OCELLI. ¥illi and large ocelli (B^")."^ In cases like these, the development of a perfect ocellus does not require a long course of variation and selection. With biids and many other animals, it seems to follow from the comparison of allied species that circular spots are often generated by the breaking up and contraction of stripes. In the Tragopan pheasant faint white lines in the female represent the beautiful white spots in the male j ^^ and something of the. Ihni' ^yno leda, Linn., from a drawing by Mr. Trimen, showing the extrant of variation in the ocelli. A, SpecimcR, froiti Mauritius, upper surface of fore-wing, A*, Specimen, from Natal, ditto, B, Specimen, from Java, upper surface of hind-wiikg> B*, Specimen, from Mauritius, ditto. aame kind may be observed in the two sexes o^the Argus pheas- ant. However this may be, appearances stroiigly favor the belief that, on the one hand a dark spot is often formed by the coloring matter being drawn toward a central point from a surrounding zone, which latter is thus rendered lighter ; and, on the other hand, that a white spot is often formed by the color being driven away from a central point, so that it accu- mulates in a surrounding darker zone. In either case an ocellus *• This wood-cut has been engraved from a beautiful drawing, most kindly made for me by Mr. Trimen ; see also his description of the wonderful amount of variation in the coloration and shape of the wings of tbt* butterfly, in his " Rhopalocera Africse Au^ tralis," p. 186. ?"Jerdon, " Uirds of India," vol. & pk 5x7-. 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 Hurst
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear
