IDIOMS  OF  CASE  CONSTRUCTION                     93

without any rest in camp for many days in succession; and this
rendered them capable of the greatest labors. 16. Three thou¬
sand horses belong to these savages, with which they have
made a three days' march ^^ in a little more than two days.

I. 45, g. 2. ' from which they come '; 4:5, e. 3. * not of great
height.' 4. Use extremus in the proper construction. 5. What is
the real meaning of this word here ? 6. Express this noun here; the
expression evidently does not faU under 105, b. 7. Omit this word,
and use the plural of the proper indefinite pronoun; or say 'that
they may have who may tell,' the antecedent of ' who' being the un-
expr ssedobject of'have.' 8. 'things.' 9. 'greatest.' 10. 'greater.'
II. See 61, n. 5. 12. ' a march of three days ': triduum and similarly
formed words are compounded of a numeral adjective and dies.
The adjective necessary to the construction of 106 is therefore present
in the word itself, and the apparently unmodified genitive may con¬
sequently be used.

LESSON  XXI

IDIOMS OF CASE CONSTRUCTION (Continued)

109.  Diinension and extent.

The dimensions of an object may be expressed in Latin either
by the genitive of measure or by the accusative of extent of space.
The direction of extent, in height, in width, etc., is expressed in
Latin by in with the accusative.

He constructed a wall nineteen miles {long), sixteen feet in height,
milia passuum XIX murum in altitudinem pedum sedecim perducit.

a. When the dimensions are expressed in Latin by the ac¬
cusative instead of by the genitive, the adjectives high, wide,
etc., may be used in agreement with the noun, as well as the
phrases in height, etc.

Trenches were constructed, each five feet deep, fossae quinos pedes
altae ducebantur.