I Assume that in Latin there was a stress accent which, in the time of Lucretius, was governed by the well-known ‘law of the penultimate’; also that in Latin poetry, although the metre is determined by the quantity of the syllable, nevertheless the stress accent must not be ignored. In fact, the inter-relation of the ictus of the quantitative metre with the stress accent is a most important factor in determining the rhythm of the verse. It is well known that in the Latin hexameter special importance was attached to the coincidence of ictus and accent in the fifth and sixth feet, so as to secure a characteristic and definite ending to the line. But the coincidence or clash of ictus and accent has its effect in every foot, although to a less extent. Particularly in the fourth foot is it important. There is an obvious difference between a line in which stress accent reinforces the ictus in the fourth, fifth, and sixth feet, and a line in which conflict occurs between ictus and accent in the fourth foot. W. F. J . Knight refers to these lines as homodyned and heterodyned. Each foot of the hexameter could be examined for the effect of homodyne and heterodyne; I am limiting this discussion to the fourth foot. In classifying fourth feet as homodyned or heterodyned, I have described as homodyned a foot in which a stress accent coincides with the ictus; all other feet are heterodyned. It must be realized, however, that there are possible varieties of homodyned fourth feet. They may be spondaic or dactylic; they may be caused by the overlap of the last two (or three) syllables of a polysyllabic word, or they may consist of a single word or two words. There is a great difference of metrical effect. Heterodyned lines may again be differentiated between those which contain a stress accent clashing with the ictus, and those in which there is no stress accent at all.