 Answering an invitation from Henry de Monfreid, Teilhard undertook a journey of two months in Obock, in Harar in the Ethiopian Empire, and in Somalia with his colleague Pierre Lamarre, a geologist, before embarking in Djibouti to return to Tianjin.While in China, Teilhard developed a deep and personal friendship with Lucile Swan.During 1930–1931, Teilhard stayed in France and in the United States.