These drawings are all from 1906. I'm assuming that Flagg wrote the verse also. I don't know how many issues this series ran in. I wish I had more of them.
UPDATE, 8/30/08: Google Books has a copy of Flagg's "Why They Married" available for download in PDF. Unfortunately, they did an inexcusably crappy job with some of the scanning.
Further UPDATE: Project Guttenberg has a better version here.
Yet more UPDATE, 10/3/11: Another drawing in this series uploaded.