bzjlec tions. 4. Impetus has the Nom., Ace., and AbI. Sing., and the Nom. and Ace. Plu.; viz. impetus, impetum, impetii, impetiis. 5. a. Preci, precem, prece, lacks the Nom. and Gen. Sing. b. Vicis, vicem, vice, lacks the Nom. and Dat. Sing. 6. Opis, dapis, and friigis, - all lack the Nom. Sing. 7. Many monosyllables of the Third Declension lack the Gen. Plu.; as. cor, liix, sol, aes, as (oris), riis, sal, tiis. Indeclinable
Nouns.
58. Here belongfas, n., right. instar, n., likeness. mane, n., morning.
nefas, n., impiety. nihil, n., 1lothing. secus, n., sex,
I. With the exception of mane (which may serve also as Ablative, in the morning), the nouns in this list are simply Neuters confined in use to the Nominative and Accusative Singular.
Heteroclites.
-59. These are nouns whose forms are partly of one declension, and partly of another. Thus:I. Several nouns have the entire Singular of one declension, the Plural IS of another; as,-
vas, vasis (vessel) ; jiigerum, jiigeri (acre);
while
Plu., vasa, vasorum, vasis, etc. Plu., jiigera, jiigerum, jiigeribus, etc.
2. Several nouns, while belonging in the main to one declension have certain special forms belonging to another. Thus :.- -
a) Many nouns of the First Declension
ending in -ia take also a Nom. and Ace. of the Fifth; as, materi~s~matertem, material, as well as materia, materiam. b) Fames, hunger, regularly of the Third Declension, has the Abl. fame of the Fifth. c) Raquies, requiefis, rest, regularly ot the Third Declension, takes an Ace. of the Fifth, requiem, In addition to requi~tem. Ii) Besides plebs, plebis, common peopte O! the Third Declension, we find plebes, pleb~i (also plebi, see ยง 52.2), of the ifth.