AS IS generally known, the unrounding of 'short o,' which began in seventeenth-century England, has produced a considerable range of variation in present-day speech. In southern England the rounded [D] though usually considered standard,1 is often replaced by [a]. In America, the range extends from [a] through [a] and [n] to [v], with additional diphthongal variants in the South. In some categories of the 'short-o' words, the range is minimal: hot, stop, and lockJ except for minor local preferences for [a] or [D], are overwhelmingly pronounced with [a]. On the other hand, words like log, gong, honk, torest>2 and warrant show the full range of variation, some of them with distinct regional patterns. The word on differs from other 'short-o? words in two respects: it has a very frequent unstressed form, generally pronounced somewhat like [an]; its stronger forms show regional variations which do not correspond very closely with those of other 'short-o' words. In order to get at the regional variations I have tested the word chiefly at the ends of such phrases as '... turned the radio on' and '.... time to be getting on,' where at least a moderate degree of stress is normal. I have classiEed the [a] and [a] variations as unrounded; [n] and [v], as rounded, though [D] may often, and [v] occasionally, be produced withoult noticeable liprounding. The [a] variation occurs most frequently in the Ontario watershed in New York, occasionally in the Great Lakes area further west, and spottily as far away from the Lakes as Connecticut and Pennsylvania. Of the rounded varieties, [n] is more frequent in New England; [o], in the South. In the following data, [a] and [a] are recorded as U for unrounded; [D] and [v], as R for rounded: Maine: U 13 instances, R 9 instances, U 59%; New Hampshire: U 19, R 3, U 86%; Vermont: U 99, R 5, U 95%; Massachusetts: U 116, R 3y, U 76%; Rhode Island: 21 instances, all U; Connecticut: U 79, R 1, U 98%; New York: U 1766, R 14, U 99%; northern3 New Jersey: U 320, R 31, U 91%o; southern New Jersey: U 26, R 52, R 67%; northern