Alectorænas pulcherrimus, [429]

Allen, Mr. J. A., on variation, [58]

Allied species occupy separate areas, [478]

Alpine plants, their advantages as colonisers, [503]

Alternations of climate in Switzerland and North America, [121]

Alternations of climate, palæontological evidence of, [119]

Amazon, limitation of species by, [18]

Amblyrhynchus cristatus, [279]

American genera of reptiles in Madagascar, [417]

Amphibia, dispersal of, [76]