The correct rendering of this phrase is undoubtedly that given by F.
NEWMAN, "For the benefit of whom?" but it is generally used in such a
manner as to make it indifferent whether that, or the corrupted
signification "For what good?" was intended by the writer making use of it.
The latter is, however, the idea generally conveyed to the mind, and in
this sense it is used by the best writers. Thus, _e.g._:
"The question '_cui bono_,' to what practical end and advantage do your
researches tend? is one," &c.--Herschel's _Discourse on Nat.
Philosophy_, p. 10.