page 24 note * Much information may be derived from the works of Owen, Gervais, Gay, Gray, Hamilton Smith, Crawfurd, Darwin, Leidy, Lubbock, Pictet, Brotin, Falconer, Sclatcr, Bartlett, Nott, Gliddon, Blyth, Laird, Sykes, Youatt, Schreber, Wagner, and others, and at the end of this series I shall give a list of the authors to which I have referred.

In the geographical distribution of animals into provinces, I follow the philosophical arrangement proposed by Dr. P. L. Selater, who has applied the classification to ornithological arrangement with so much success.