Absorption of Light due to the Presence of Pigments.By far the commonest source of colour in invertebrate animals is the presence in the skin of definite pigments which absorb all the rays of light except those of a particular wave length, thus giving the effect of a particular colour. Pigments are found also in the hair and skin of mammals, in the feathers of birds, and in the horny integument of reptiles. A great variety of pigments have been approximately isolated and their chemical nature studied but it would be beyond the scope of the present work to attempt any general account of animal pigments. Those interested in the subject may refer to Krii kenberg's Vergleichend physiologische Studien, to papers by Dr. Sorby, Dr. Macmunn and others in the Proceedings of flee Royal Society, the Quarterly Journal of ?ficroscom'cxl Science and elsewhere.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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