Cecil Champain Lowis, The Tribes of Burma — The Tibeto-Burman Wave (1910)
“ We must keep this crescent in mind when we consider the movement of the Tibeto-Burmans from the north, for along a considerable portion of its length it is practically an insuperable barrier, and it is clear that as the Tibeto-Burman tribes came down, some of them were brought up by its snow-clad heights and were obliged, if they wished to pursue their southerly course, either to come out east and follow the Salween southwards or fetch a circuit towards Assam and the Brahmaputra in the west and so reach hill-ridges and fresh valleys along which their way could be pursued. ”
