_Which_ sometimes relates to a member of a sentence, or to a whole
sentence, for its antecedent: as, "We are required to fear God and keep
his commandments, _which_ is the whole duty of man." What is the whole
duty of man? "To fear God and keep his commandments:" therefore, this
phrase is the antecedent to _which_.
The conjunction _as_, when it follows _such, many_, or _same_, is
frequently denominated a relative pronoun; as, "I am pleased with _such
as_ have a refined taste;" that is, with _those who_, or _them who
have_, &c. "Let _such as_ presume to advise others, look well to their
own conduct;" that is, Let _those_, or _them who_ presume, &c. "_As many
as_ were ordained to eternal life, believed;" that is, _they, those_, or
_all who_ were ordained, believed. "He exhibited the _same_ testimonials
_as_ were adduced on a former occasion;" that is, _those_ testimonials
_which_ were adduced, &c. But, in examples like these, if we supply the
ellipsis which a critical analysis requires us to do, _as_ will be found
to be a conjunction; thus, "I am pleased with _such persons, as those
persons are who_ have a refined taste; Let _such persons, as those
persons are who_ presume," &c.