IT is well known that Tamil in contradistinction to other Dravidian languages does not admit of the voiced stops g, j, d, b at the beginning of a word ; whereas in the middle of a word the unvoiced sounds are represented by the voiced, though the writing takes no notice of this distinction. Caldwell (3rd ed., p. 138), formulating this state of affairs as the“ Convertibility of Surds and Sonants ”, assumes it to have been characteristic of the primitive Dravidian tongue. In this most people have tended to follow him. More recently, however, contrary opinions have been expressed, notably by M. Jules Bloch.