[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), Grundzüge 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}.