Here is the explanation from my most recent acquisition,The Elements of Grammar by Samuel S. Greene, A.M. Philadelphia: H. Cowperthwaite & Co., 1855.
Those limiting adjectives which may, without the use of the article, represent a noun when understood, are called pronominal adjective; as, "That (book) is his; this is yours."
The principal pronominal adjectives are, this, that, these, those, former, latter, which, what, each, every, either, neither, some, one, none, any, all, such, much, both, few, fewer, fewest, first last, little, less, least, many, more, most, own, some, several, sundry, enough.
The book goes on to give declensions of the words one and other. I didn't even know you could decline nouns or pronouns. You learn something every day.