alvus, belly; carbasus, flax; colus, distaff; humus, ground; vannus, winnowing-fan.

  c) A few Greek Feminines; as,—­

    atomus, atom;
    diphthongus, diphthong.

2.  The following nouns in -us are Neuter:—­

  pelagus, sea;
  virus, poison;
  vulgus, crowd.

Greek Nouns of the Second Declension.

27.  These end in -os, -os, Masculine or Feminine; and -on, Neuter.  They are mainly proper names, and are declined as follows:—­

          Barbitos, m.  Androgeos, m., Ilion, n.,
          and f., Androgeos. Troy.
          lyre.
  Nom. barbitos Androgeos Ilion
  Gen. barbiti Androgeo, -i Ilii
  Dat. barbito Androgeo Ilio
  Acc. barbiton Androgeo, -on Ilion
  Voc. barbite Androgeos Ilion
  Abl. barbito Androgeo Ilio

1.  Nouns in -os sometimes form the Accusative Singular in -um instead of -on; as, Delum, Delos.

2.  The Plural of Greek nouns, when it occurs, is usually regular.

3.  For other rare forms of Greek nouns the lexicon may be consulted.

* * * * *

THIRD DECLENSION.

28.  Nouns of the Third Declension end in -a, -e, -i, -o, -y, -c, -l, -n, -r, -s, -t, -x.  The Third Declension includes several distinct classes of Stems,—­

    I. Pure Consonant-Stems. 
   II. i-Stems. 
  III.  Consonant-Stems which have partially adapted themselves to the
        inflection of i-Stems. 
   IV.  A very few stems ending in a long vowel or a diphthong. 
    V. Irregular Nouns.

I. Consonant-Stems.

29. 1.  In these the stem appears in its unaltered form in all the oblique cases, so that the actual case-endings may be clearly recognized.

2.  Consonant-Stems fall into several natural subdivisions, according as the stem ends in a Mute, Liquid, Nasal, or Spirant.

A.  Mute-Stems.

30.  Mute-Stems may end,—­

1.  In a Labial (p); as, princep-s.

2.  In a Guttural (g or c); as, remex (remeg-s); dux (duc-s).

3.  In a Dental (d or t); as, lapis (lapid-s); miles (milet-s).

1.  STEMS IN A LABIAL MUTE (p).

31.  Princeps, m., chief.

SINGULAR.        TERMINATION.
Nom.  princeps        -s
Gen.  principis       -is
Dat.  principi        -i
Acc.  principem       -em
Voc.  princeps        -s
Abl.  principe        -e

PLURAL.
Nom.  principes       -es
Gen.  principum       -um
Dat.  principibus     -ibus
Acc.  principes       -es
Voc.  principes       -es
Abl.  principibus     -ibus

2.  STEMS IN A GUTTURAL MUTE (g, c).