June and July 1914 in McClure's; may also have been published in The Story-Teller July 1914
August 23 and 30, 1913 in Collier's; may also have been serialized in Pall Mall Magazine August 1914
April 1912 in McClure's under the title THE ROAD TO TULI
April 1913 in McClure's under the title THE MOLLMEIT
ON THE WAY TO BEIRA
PROGRESS
THE PROMISE OF LIFE
Any Constable edition is extremely rare. I only own a July 1919 reprint, but it does have its original DJ. John Long reprinted this in London.
The Putnam edition is more common, but the original DJ is extremely rare. I own a first edition with original DJ, as well as a Grosset and Dunlap reprint (Photoplay edition).