Apparatus, apparatus _or_ apparatuses; heathen, heathen _or_ heathens.
(The following nouns have the same form in both numbers when used with
numerals; they add _s_ in other cases; as, _four score, by scores_.)
Dozen, score, yoke, hundred, thousand.
The following nouns have no plural.
(These are generally names of materials, qualities, or sciences.)
Names of materials when taken in their full or strict sense can have no
plural, but they may be plural when kinds of the material or things made of
it are referred to; as, _cottons, coffees, tins, coppers_.
+Direction.+--_Study the following list of words:_--
Bread, coffee, copper, flour, gold, goodness, grammar (science, not a
book), grass, hay, honesty, iron, lead, marble, meekness, milk, molasses,
music, peace, physiology, pride, tin, water.
The following plural forms are commonly used in the singular.
Acoustics, ethics, mathematics, politics (and other names of sciences in
_ics_), amends, measles, news.
The following words are always plural.
(Such words are generally names of things double or multiform in their
character.)
+Direction+.--_Study the following list_:--
Aborigines, annals, ashes, assets, clothes, fireworks, hysterics, literati,
mumps, nippers, oats, pincers, rickets, scissors, shears, snuffers, suds,
thanks, tongs, tidings, trousers, victuals, vitals.
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