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arities of Nouns of the Fourth Declension.
49. 1. Nouns in -us, particularly in early Latin, often form the Genitive Singular in -Ä«, following the analogy of nouns in -us of the Second Declension; as, senÄtÄ«, ÅrnÄtÄ«. This is usually the case in Plautus and Terence.
2. Nouns in -us sometimes have -ū in the Dative Singular, instead of -uī; as, frūctū (for frūctuī).
3. The ending -ubus, instead of -ibus, occurs in the Dative and Ablative Plural of artūs (Plural), _limbs_; tribus, _tribe_; and in dis-syllables in -cus; as, artubus, tribubus, arcubus, lacubus. But with the exception of tribus, all these words admit the forms in -ibus as well as those in -ubus.
4. Domus, house, is declined according to the Fourth Declension, but has also the following forms of the Second:--
domÄ« (locative), _at home_; domÅ, _from home_; domum, homewards, _to one's home_; domÅs, homewards, to their (etc.) homes 5. The only Neuters of this declension in common use are: cornÅ«, _horn_; genÅ«, _knee_; and verÅ«, spit.
Exceptions to Gender in the Fourth Declension.
50. The following nouns in -us are Feminine: acus, _needle_; domus, _house_; manus, _hand_; porticus, _colonnade_; tribus, _tribe_; Īdūs (Plural), _Ides_; also names of trees (§ 15, 2).
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FIFTH DECLENSION.
Ä“-Stems.
51. Nouns of the Fifth Declension end in -Ä“s, and are declined as follows:--
Diēs, m., day. Rēs, f., thing. SINGULAR. PLURAL. SINGULAR. PLURAL. _Nom._ diēs diēs rēs rēs _Gen._ diēī diērum rĕī rērum _Dat._ di&Aum