demonstrated, was of a kind that no professor could have ventured
openly to teach in the days of Elizabeth and James. The concluding
chapter of the present work makes a powerful statement of the position
which a man, conscious of great and noble aims, would then have
occupied; and shows, too, how familiar the age was with all methods of
secret communication, and of hiding thought beneath a masque of
conceit or folly. Applicably to this subject, I quote a paragraph from
a manuscript of the author's, not intended for present publication:--

'It was a time when authors, who treated of a scientific politics and
of a scientific ethics internally connected with it, naturally
preferred this more philosophic, symbolic method of indicating their
connection with their writings, which would limit the indication to
those who could pierce within the veil of a philosophic symbolism. It
was the time when the cipher, in which one could write '_omnia per
omnia_,' was in such request, and when 'wheel ciphers' and 'doubles'
were thought not unworthy of philosophic notice. It was a time, too,
when the phonographic art was cultivated, and put to other uses than
at present, and when a '_nom de plume_' was required for other
purposes than to serve as the refuge of an author's modesty, or
vanity, or caprice. It was a time when puns, and charades, and
enigmas, and anagrams, and monograms, and ciphers, and puzzles, were
not good for sport and child's play merely; when they had need to be
close; when they had need to be solvable, at least, only to those who
_should_ solve them. It was a time when all the latent capacities of
the English language were put in requisition, and it was flashing and
crackling, through all its lengths and breadths, with puns and quips,
and conceits, and jokes, and satires, and inlined with philosophic
secrets that opened down "into the bottom of a tomb"--that opened into
the Tower--that opened on the scaffold and the block.'