Study of the Structure of Feathers, With Reference to Their Taxonomic Significance

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Since feathers are external and in constant contact with the environment, they would naturally be expected to be among the first structures of the body to feel the influence of environmental changes and shocks, and would still be as liable to change by hybridization, orthogenesis or any other method of evolution, as any of the other structures.