2458. For the general rule of position, see 177, 178; but, except in the
thesis of a foot, a final syllable ending with a short vowel generally
remains short before a word beginning with two consonants or a double
consonant: as, #molliă strāta#, #nemorōsă Zacȳnthos#, #lūcĕ smaragdī#.
In Horace such a final syllable is never lengthened before a word
beginning with two consonants.