2. Abstract terms, as:

jeunesse, youth.
beauté, beauty.
bienveillance, kindness.
immortalité, immortality.
bonté, goodness.
courage, courage.

3. Adjectives used substantively, as:

le beau, the beautiful.
l'utile, the useful.

§ 8. Nouns having no Singular.

annales, annals.
denrées }provision.
vivres }
étrennes, New-year's present.
fiancailles, betrothing.
frais, expenses.
gages, wages.
gens, people.
lunettes, spectacles.
vitraux, window-glass, etc.

§ 9. Proper Names.

1. These are used invariable, as:

Deux Napoléon ont régné en France. Two Napoleons have reigned in France.
Les deux Corneille sont nés à Rouen. The two Corneilles were born at Rouen.

2. When, however, we speak of famous men as a class, then the plural form is used, as: