Theories and facts as to palaeogenesis in its probable influence on the coloration of animals / by Jonathan Hutchinson.

  • Hutchinson, Jonathan, Sir, 1828-1913.
Date:
1912
Catalogue details

Licence: In copyright

Credit: Theories and facts as to palaeogenesis in its probable influence on the coloration of animals / by Jonathan Hutchinson. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    10/76 (page 6)
    In order to determine the real markings, it is desirable to see specimens of the animal both when fully grown and when old ; also one of each sex at the several ages and under various seasonal states. In the human subject, changes, which are not infrequently associated with those of disease, render obvious, for the first time, markings in the skin, which were certainly original endowments. To show the streaks of the Zebra as modified by position. (Copied by permission from the Zoological Society’s Garden ‘ Catalogue.’) What I have named the “ Porcupine-patch ” is sacral or lumbo-sacral. It is, of course, a modification, or development, of a special part of the dorsal streak. This patch grows the “quills,” whilst the rest of the back produces only modified hair. In the adult Hedgehog the whole back and sides develop spines, but in the young animal only the 11 Porcupine-patch has spines. There are many transitional forms. In many animals, bristles or very coarse hairs are produced on the Porcupine-patch, and even in some human subjects there is a definite patch of coarse hair across this region. Virchow attributed the hair-patches which he had observed