The quantity of vowels must in general be learned by observation; but
some convenient helps for the memory may be found in 2429; and the
quantity of many vowels may be ascertained by the general principles
given in 35 and 36. Except in the case of _Hidden Quantity_ (2459), the
quantity of vowels is in general ascertained from verse. But some
information may also be gleaned from such rhetorical prose as exhibits
well defined habits in the rhythmical endings selected for sentences
(#clausulae#, Cic. _O._ 191-226).
(A.) SHORT VOWELS.