He returned for further explorations in southeast Alaska in 1880 and in 1881 was with the party that landed on Wrangel Island on the USS Corwin and claimed that island for the United States. He documented this experience in journal entries and newspaper articles—later compiled and edited into his book The Cruise of the Corwin. In 1888 after seven years of managing the Strentzel fruit ranch in Alhambra Valley, California, his health began to suffer. He returned to the hills to recover, climbing Mount Rainier in Washington and writing Ascent of Mount Rainier.