§55. In chapters III and IV we have discussed those forms that are everywhere found with clear preponderance in the second hemistich of the pentameter: the neuter plural, nominative, accusative, and vocative, and the masculine and feminine singular, nominative and vocative. All other categories of forms (as these categories are determined in the tables of chapters VII and VIII) preponderate just as clearly in the first hemistich, with two equivocal exceptions: first, the neuter singular, nominative, accusative, and vocative, which is found in the second hemistich in proportions ranging from 43.2% (Propertius, book I) to 62.2% (Tibullus, book I), and second, other cases of the singular, in all genders, which occur preponderantly, to be sure, in the first hemistich, but in proportions for the most part so close to 50% that no conclusions could be based upon this fact without further investigation.
A Mon, study studied this question.