The expedition departed from New York City on 31 March 1929 aboard the Pinchots' yacht Mary Pinchot. Gifford Pinchot organized, financed, and led the expedition, which collected zoological specimens for the U.S. National Museum of Natural History. The captain was Frederick A. Brown of Port Jefferson, New York, and the chief engineer was Henry Christensen. Aboard ship, besides the captain and crew, were Gifford Pinchot, his wife Cornelia Bryce Pinchot, Gifford Pinchot, Jr., and Pinchot Jr.'s schoolmate Steve Stahlnecker. The expedition's photographer was Howard H. Cleaves, and its physician was J. B. Mathewson. The expedition's professional scientists were the malacologist Henry A. Pilsbry and the ornithologists A. K. Fisher and Alexander Wetmore. Harry A. Slattery accompanied the expedition from New York City to Panama. The yacht Mary Pinchot visited Key West and then Havana. The expedition then visited Grand Cayman, the Swan Islands, Isla de Providencia and Isla de San Andrés for collecting specimens. The Mary Pinchot went through the Panama Canal and then to Cocos Island. The expedition collected in the Galápagos, Marquesas, and Tuamotus. The expedition reached its final destination, Tahiti, on October 15. Before the end of October, Pinchot's party departed Tahiti and then returned by steamer to San Francisco. By early November, Pinchot and his family were in Washington, D.C. Captain Brown and the crew of the Mary Pinchot went back through the Panama Canal and arrived at the yacht's winter station at Savannah, Georgia in December 1929.
Documentary of the expedition
Howard Cleaves documented the expedition with a motion picture film that was shown in movie theaters throughout the United States. Cornelia Bryce Pinchot gave free talks with showings of Cleaves's documentary film. Mordaunt Hall, a 1930s movie critic, wrote concerning Cleaves's film:
Collections and discoveries
The expedition brought back several living reptiles: On Isla de Providencia, the expedition discovered a new lizard species, which Doris Cochran named Anolis pinchoti. The expedition discovered the fish species Entomacrodus corneliae, which Henry Fowler named Giffordella corneliae. The expedition's malacologist Pilsbry identified several new mollusk species, including the genus Giffordius and Chionopsis pinchoti. Pilsbry's claim of a new speciesDrymaeus pinchoti is rejected in favor of the subspecies Drymaeus rufescens pinchoti; Codakia pinchoti is rejected in favor of Codakia distinguenda. A. K. Fisher and Alexander Wetmore, with the assistance of Pinchot Sr. and Jr., collected approximately 500 bird skins and skeletons and a few eggs; Fisher made detailed field notes.
