Listening to Stone: The Art and Life of Isamu Noguchi by Hayden Herrera:
After this marriage declaration, Leonie appears to have moved in with him at his apartment at 121 West Sixty-fourth Street. Their cohabitation probably lasted about half a year. (There are no letters from him to her during this period.) In February she became pregnant, but neither this nor his “marriage” to Leonie prompted Yone to end his relationship with Ethel. Indeed in June 1904, when Leonie was four months pregnant, he wrote to Stoddard that he was still planning to marry Ethel. On August 3, 1904, Yone left New York, traveling by train first to Birmingham, Alabama, where he stayed with Ethel’s family for four days, and from there to San Francisco, where he boarded the Manchuria bound for Japan. He appears to have had little regret at leaving the six-months-pregnant Leonie behind.