Institutio Oratoria

I will follow the natural order and will begin by pointing out that there are some blemishes so obvious that even the uneducated regard them as worthy of censure; I refer to occasions when two consecutive words form some unseemly expression by the coalescence of the last syllable of the first word and the first of the second. [*](cp. VIII. 45. ) Again, there are occasions when vowels clash. When this happens, the language is broken by gaps and interstices and seems to labour. The most unpleasing effects of sound will be produced by the juxtaposition of the same long vowels, while the worst hiatus occurs between vowels which are pronounced hollow- or open-mouthed. [*](i.e. A, O, U. )

E has a flatter, i a narrower sound, and consequently such blemishes are less noticeable where they are concerned. It is a less serious fault to place short vowels after long, a statement which applies even more strongly to placing short vowels before long. But the least unsatisfactory combination is that of two short vowels. And in all conjunctions of vowels, the resulting sound will be proportionately soft or harsh according as they resemble or differ from each other in the method of utterance.