The colours of animals : their meaning and use, especially considered in the case of insects (1890)
Poulton, Edward Bagnall, Sir, 1856-1943 · New York : D. Appleton · leaf 134
6 THE COLOURS OF ANIMALS spreads the upper margin, gradually eclipsing the rufous-brown shade, which remains the evidence of the previous plumage (fig. 20). Hence are shown two successive stages of the development of the dark brown shade which at last removes all traces of the reddish tint (figs.… … Tig. 20. Fig. 21. JPig. 22. to the cold, acting through the medium of the nervous system. This is, however, very far from being proved ; for it does not appear to be certain that there is a single species becoming white in winter which retains its dark colour at this time of the year in the…
Animals · Insects
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
