lyses
bacterium bacteria
beau beaux
cherub cherubim (or cherubs)
crisis crises
curriculum curricula
datum data
genus (meaning "class") genera
genius {geniuses (persons or great ability)
{genii (spirits)
hypothesis hypotheses
oasis oases
parenthesis parentheses
phenomenon phenomena
seraph seraphim (or seraphs)
stratum strata
tableau tableaux
thesis theses

[19] "Foundations," pp. 47-48.

EXERCISE XIV.[20]

1. _Write the plural of_: Alumna, analysis, beau, cherub, crisis,
curriculum, genus, genius, hypothesis, nebula, oasis, parenthesis,
phenomenon, synopsis, seraph, stratum, tableau.
2. _Write the singular of_: Alumni, curricula, data, bacteria,
cherubim, oases, phenomena, seraphim, strata, theses.

GENDER.--The following nouns of different genders are sometimes
confounded or otherwise misused:--

_Masculine_. _Feminine_.
abbot abbess
actor actress
bachelor spinster, maid
buck doe (fallow deer)
bullock heifer
czar czarina
drake duck
duke duchess
earl countess
Francis Frances
gander goose
hero heroine
lion lioness
marquis, marquess marchioness
monk nun
ram ewe
stag, hart hind (red deer)
sultan sultana
tiger tigress
wizard witch

[20] TO THE TEACHER.--To have any value this must be given as a
dictation exercise.

EXERCISE XV.[21]

1. _Write the feminine word corresponding to:_ Abbot, actor, bachelor,
buck, bullock, czar, duke, drake, earl, Francis, hero, lion, marquis,
monk, ram, stag, sultan, hart, tiger.
2. _Write the masculine word corresponding to:_ Spinster, duck, doe,
Frances, goose, heifer, ewe, hind, witch.

[21] TO THE TEACHER.--This should be used as a dictation exercise.

EXERCISE XVI.

_Correct the following sentences:_--

1. The marquess was the executor of her husband's estate.
2. He married a beautiful actor.
3. The tiger broke from its cage.
4. The duck was pluming his feathers after his swim, and the goose had
wand