Innermostasia 105 - Men at work on new barrageacross flood bed above Tulkuch-tarim - Stein paid special attention to current efforts at irrigation and developments in agriculture between his several visits. He related all he learned to possible similar conditions at the time of the medieval ruins he was excavating. Frequent new dams and canals were made necessary by the changes in the course of the small rivers flowing from the Kun-lun into the Taklamakan. As this photo indicates and Stein noted sometimes it was a lack of manpower that prevented construction of new irrigation facilities.