_Encyclopedia of Indexes, or Tables of Contents._--I should like your
opinion, and that of the readers of "N. & Q.," as to the desirableness and
practicability of forming a collection of the indexes of those books most
commonly required to be referred to by authors and scholars. In reading up
on any subject, when it is wished to know whether any author treats upon
it, mainly or incidentally, his works must be examined at a great expense
of time and labour. Perhaps some of your learned readers will express their
views as to the value of such a thesaurus, and give suggestions as to the
principles which ought to regulate its execution.