1}.

[236] Major General Alfred Wilks Drayson, author of various works on
geology, astronomy, military surveying, and adventure.

[237] Hailes also wrote several other paradoxes on astronomy and circle
squaring during the period 1843-1872.

[238] See Vol. I, page 43, note 8 {33}.

[239] See Vol. I, page 43, note 7 {32}.

[240] "Very small errors are not to be condemned."

[241] He seems to have written nothing else.

[242] Besides the paradoxes here mentioned by De Morgan he wrote several
other works, including the following: _Abriss der Babylonisch-Assyrischen
Geschichte_ (Mannheim, 1854), _A Popular Inquiry into the Moon's rotation
on her axis_ (London, 1856), _Practical Tables for the reduction of the
Mahometan dates to the Christian kalendar_ (London, 1856), _Grundzuege einer
neuen Weltlehre_ (Munich, 1860), and _On the historical Antiquity of the
People of Egypt_ (London, 1863).

[243] Dircks (1806-1873) was a civil engineer of prominence, and a member
of the British Association and the Royal Society of Edinburgh. He wrote
(1863) on "Pepper's Ghost," an ingenious optical illusion invented by him.
There was a second edition of the _Perpetuum Mobile_ in 1870.

[244] George Stephenson (1781-1848), the inventor of the first successful
steam locomotive. His first engine was tried in 1814.

[245] Robert Stephenson (1803-1859), the only son of George. Most of the
early improvements in locomotive manufacture were due to him. He was also
well known for his construction of great bridges.

[246] "In its proper place."

[247] "A fool always finds a bigger fool to admire him."

[248] See Vol. I, page 43, note 7 {32}.

[249] See Vol. I, page 43, note 8 {33}.

[250] See Vol. I, page 85, note 2 {129}.

[251] See Vol. I, page 390, note 1 {390}.

[252] From 1823 to 1852 it was edited by I. C. Robertson; from 1852 to 1857
by R. A. Brooman; and from 1857 to 1863 by Brooman and E. J. Reed.

[253] Sir James Ivory (1765-1842) was, as a young man, manager of a flax
mill in Scotland. In 1804 he was made professor of mathematics at the Royal
Military College, then at Marlow and later at Sandhurst. He was deeply
interested in mathematical physics, and there is a theorem on the
attraction of ellipsoids that bears his name. He was awarded three medals
of the Royal Society, and was knighted together with Herschel and Brewster,
in 1831.

[254] See Vol. I, page 56, note 1 {64}.

[255] See Vol. I, page 153, note 5 {338}.