the Board of Longitude, he
having been made (1818) superintendent of the Nautical Almanac and
secretary of the Board. He opposed introducing into the Nautical Almanac
anything not immediately useful to navigation, and this antagonized many
scientists.

[575] Isaac Milner (1750-1820) was professor of natural philosophy at
Cambridge (1783) and later became, as De Morgan states, president of
Queens' College (1788). In 1791 he became dean of Carlisle, and in 1798
Lucasian professor of mathematics. His chief interest was in chemistry and
physics, but he contributed nothing of importance to these sciences or to
mathematics.

[576] Thomas Perronet Thompson (1783-1869), fellow of Queens' College,
Cambridge, saw service in Spain and India, but after 1822 lived in England.
He became major general in 1854, and general in 1868. Besides some works on
economics and politics he wrote a _Geometry without Axioms_ (1830) that De
Morgan includes later on in his _Budget_. In it Thompson endeavored to
prove the parallel postulate.

[577] De Morgan's father-in-law. See note 441, page 196.

[578] Johann Friedrich Herbart (1776-1841), successor of Kant as professor
of philosophy at Koenigsberg (1809-1833), where he established a school of
pedagogy. From 1833 until his death he was professor of philosophy at
Goettingen. The title of the pamphlet is: _De Attentionis mensura causisque
primariis. Psychologiae principia statica et mechanica exemplo
illustraturus.... Regiomonti,... 1822_. The formulas in question are given
on pages 15 and 17, and De Morgan has omitted the preliminary steps, which
are, for the first one:

[beta] ([phi] - z) [delta]t = [delta]z

unde [beta]t= Const / ([phi] - z).

Pro t = 0 etiam z = 0; hinc [beta]t = log [phi]/([phi] - z).

z = [phi] (1 - [epsilon]^{-[beta]t});

et [delta]z/[delta]t = [beta][phi][epsilon]^{-[beta]t}

These are, however, quite elementary as compared with other portions of the
theory.

[579] See note 371, page 168.

[580] William Law (1686-1761) was a clergyman, a fellow of Emanuel College,
Cambridge, and in later life a convert to Behmen's philosophy. He was so
free in his charities that the village in which he lived became so infested
by beggars that he was urged by the citizens to leave. He wrote _A serious
call to a devout and holy life_ (1728).

[581] He was a curate at Cheshunt, and wrote the _Spiritual voice to the
Christian Church and to the Jews_ (London, 1760), _A