Distributives either and neither.
422. By their original meaning, either and neither refer to only two persons or objects; as, for example,—
Some one must be poor, and in want of his gold—or his corn. Assume that no one is in want of either.—Ruskin
Their [Ernest's and the poet's] minds accorded into one strain, and made delightful music which neither could have claimed as all his own.—Hawthorne.
Use of any.
Sometimes these are made to refer to several objects, in which case any should be used instead; as,—
Was it the winter's storm? was it hard labor and spare meals? was it disease? was it the tomahawk? Is it possible that neither of these causes, that not all combined, were able to blast this bud of hope?—Everett.
Once I took such delight in Montaigne ...; before that, in Shakespeare; then in Plutarch; then in Plotinus; at one time in Bacon; afterwards in Goethe; even in Bettine; but now I turn the pages of either of them languidly, whilst I still cherish their genius.—Emerson.
Any usually plural.
423. The adjective pronoun any is nearly always regarded as plural, as shown in the following sentences:—