In subsequent years he became a collector for Sargent at the Arnold Arboretum, and made further expeditions to China in 1907, 1908, and 1910, as well as to Japan (1911–1916), where he collected 63 named forms of cherry blossom.
In subsequent years, he worked as a collector for Sargent at the Arnold Arboretum; in 1907, 1908, and 1910, and from 1911 to 1916, he undertook further trips to China and Japan. During these excursions, he collected 63 named forms of cherry blossom.