Multiple Origins of Tibetan o

Widespread agreement prevails that Tibetan o is the result of the merger of several distinct sounds in proto-Tibeto-Burman. Here I attempt to reconcile Matisoff and Gong’s presentations of the origins of Written Tibetan o, making fuller use of philological evidence than Matisoff and taking advantage of a more recent version of Old Chinese than Gong. A number of sound laws are proposed to explain the relevant vowel correspondences among Tibetan, Burmese, and Chinese