e INTERROGATIVE ADJECTIVES are _which_ and _what_. They may
be used in direct and indirect questions. As in the pronouns, _which_
is selective among what is known; _what_ inquires about things or
persons not known.

[Sidenote: _In direct questions._]

Sentences with _which_ and _what_ in direct questions:--

_Which_ debt must I pay first, the debt to the rich, or the debt
to the poor?--EMERSON.

But when the Trojan war comes, _which_ side will you take?
--THACKERAY.

But _what_ books in the circulating library circulate?--LOWELL.

_What_ beckoning ghost along the moonlight shade
Invites my steps, and points to yonder glade?--POPE.

[Sidenote: _In indirect questions._]

Sentences with _which_ and _what_ in indirect questions:--

His head...looked like a weathercock perched upon his spindle
neck to tell _which_ way the wind blew.--IRVING.

A lady once remarked, he [Coleridge] could never fix _which_ side
of the garden walk would suit him best.--CARLYLE.

He was turned before long into all the universe, where it was
uncertain _what_ game you would catch, or whether any.--_Id._

At _what_ rate these materials would be distributed and
precipitated in regular strata, it is impossible to
determine.--AGASSIZ.

[Sidenote: _Adjective_ what _in exclamations_.]

152. In exclamatory expressions, _what_ (or _what a_) has a force
somewhat like a descriptive adjective. It is neither relative nor
interrogative, but might be called an EXCLAMATORY ADJECTIVE; as,--

Oh, _what a_ revolution! and _what a_ heart must I have, to
contemplate without emotion that elevation and that fall!--BURKE.

_What a_ piece of work is man!--SHAKESPEARE.

And yet, alas, the making of it right, _what a_ business for long
time to come!--CARLYLE

Through _what_ hardships it may attain to bear a sweet
fruit!--THOREAU.

Exercise.--Find ten sentences containing pronominal adjectives.

INFLECTIONS OF ADJECTIVES.

153 .Adjectives have two inflections,--number and comparison.

NUMBER.--_This_, _That_.

[Sidenote: _History of_ this--these _and_ that--those.]

154. The only adjectives having a plural form are _this_ and _that_
(plural _these_, _those_).

_This_ is the old demonstrative; _that_ being borrowed from the forms
of the definite article, which was fully inflected in Old English. The
article _that_ was