[Hittite shows no trace of assibilation or palatalization of the gutturals, and so the development of the Indo-European palatals seems to have been subsequent to the Indo-Hittite period. Hittite shows an independent phoneme (u or ) corresponding to the labial element of the IE labiovelare, and this state of affairs must be assumed for IH also. The loss of this labial sound had begun under certain circumstances in IH, and it continued in primitive IE and in the historic IE languages.]

In 1927 I published in this Journal (3. 71–86) a study on 'The Inflection of the Present Indicative Active in Indo-European.' Since that time, further investigation, particularly along the lines of vocalic alternation (apophony, 'Ablaut'), with its underlying factor of accent, has led me to conclusions which seem to me so much deeper in foundations and, in a measure, so much broader in results that I regard that older discussion as practically supplanted by the one which I now present.

[The article deals with ten mooted questions, for which cf. the subheadings, and also attempts to advance linguistic methodology by a criticism of some views of leading writers on Old Norse grammar.]