. Animal coloration; an account of the principal facts and theories relating to the colours and markings of animals. Color of animals. INTRODUCTORY. 41 butterflies is related to ordinary products of the metabolism of the body.* Mr. Poulton has recently found that the red fluid excreted by the Tortoiseshell and other Vanessida?, immediately after they escape from the chrysalis, contains uric acid ; the fact that this substance is evacuated in these butterflies may perhaps have something to do with the absence, or at least the presence of only traces, of a yellow colouring in these butterflies ;
. Animal coloration; an account of the principal facts and theories relating to the colours and markings of animals. Color of animals. INTRODUCTORY. 41 butterflies is related to ordinary products of the metabolism of the body.* Mr. Poulton has recently found that the red fluid excreted by the Tortoiseshell and other Vanessida?, immediately after they escape from the chrysalis, contains uric acid ; the fact that this substance is evacuated in these butterflies may perhaps have something to do with the absence, or at least the presence of only traces, of a yellow colouring in these butterflies ; metabolism must be nearly at a standstill in the butterfly. Dr. Urech has also pointed out that there is a close con- nection between the pigments found in the urine of butterflies and the colour of their wings. We might expect that caterpillars, which lead such extra- ordinarily active lives, as far as devouring food is concerned, would normally store up a quantity of integumental pigment. * Joum. Chem. Soc., 1889, and Thier. Chemie, 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 Beddard, Frank E. (Frank Evers), 1858-1925. London, S. Sonnenschein & co. ; New York, Macmillan & co.
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Keywords: ., bookauthorbeddardf, bookcentury1800, bookdecade1890, bookyear1892
