National Geographic August 1915

American Game Birds
Henry W. Henshaw, Chief of the U. S. Biological Survey, describes America’s rich heritage of waterfowl and shorebirds, and how to safeguard these gamebirds.
Nature’s Transformation at Panama: Remarkable Changes in Faunal and Physical Conditions in the Gatun Lake Region
A year after the completion of the Panama Canal, the author explores the ecological significance of the largest freshwater lake ever created by man.