I, page 309, note 2 {670}.

[329] This was his _Practical short and direct Method of Calculating the
Logarithm of any given Number, and the Number corresponding to any given
Logarithm_ (1849).

[330] This is William Neile (1637-1670), grandson of Richard Neile (not
Neal), Archbishop of York. At the age of 19, in 1657, he gave the first
rectification of the semicubical parabola. Although he communicated it to
Brouncker, Wren, and others, it was not published until 1639, when it
appeared in John Wallis's _De Cycloide_.

[331] I myself "was a considerable part."

[332] He also wrote _A Glance at the Universe_ ("2d thousand" in 1862), and
_The Resurrection Body_ (1869).

[333] See Vol. I, page 63, note 1 {74}.

[334] As Swift gave it in his _Poetry. A Rhapsody_, it is as follows:

"So, naturalists observe, a flea
Has smaller fleas that on him prey;
And these have smaller still to bite 'em.
And so proceed _ad infinitum_."

[335] Perhaps 1,600,000,000 years, if Boltwood's recent computations based
on radium disintegration stand the test. This would mean, according to
MacCurdy's estimate, 60,000,000 years since life first appeared on the
earth.

[336] De Morgan wrote better than he knew, for this work, the _Allgemeine
Encyclopaedie der Wissenschaften und Kuenste_, begun at Leipsic in 1818, is
still (1913) unfinished. Section I, A-G, consists of 99 parts in 56
volumes; Section II, H-N, consists of 43 volumes and is not yet completed;
and Section III, O-Z, consists of 25 volumes thus far, with most of the
work still to be done. Johann Samuel Ersch (1766-1828), the founder, was
head librarian at Halle. Johann Gottfried Gruber (1774-1851), his
associate, was professor of philosophy at the same university.

[337] William Howitt (1792-1879) was a poet, a spiritualist, and a
miscellaneous writer. He and his wife became spiritualists about 1850. He
wrote numerous popular works on travel, nature and history.

[338] See Vol. II, page 55, note 108.

[339] As will be inferred from the text, C. D. was Mrs. De Morgan, and
A. B. was De Morgan.

[340] Jean Meslier (1678-1733), cure of Estrepigny, in Champagne, was a
skeptic, but preached only strict orthodoxy to his people. It was only in
his manuscript, _Mon Testament_, that was published after his death, and
that caused a great sensation in France, that his antagonism to
Christianity became known.

[341] Baron Zach relates that a friend of his, in a writing intende