SIMOOM or SIMOON, a hot, dry wind-storm common to the arid regions of Africa, Arabia, and parts of India; the storm moves in cyclone (circular) form, carrying clouds of dust and sand, and produces on men and animals a suffocating effect.

SIMPLON, a mountain in the Swiss Alps, in the canton of Valais, traversed by the famous Simplon Pass (6594 ft. high), which stretches 41 m. from Brieg in Valais to Domo d’Ossola in Piedmont, passing over 611 bridges and through many great tunnels, built by Napoleon 1800-6.

SIMPSON, SIR JAMES YOUNG, physician, born, the son of a baker, at Bathgate, Linlithgowshire; graduated M.D. at Edinburgh in 1832; was assistant to the professor of Pathology and one of the Presidents of the Royal Medical Society before his election to the chair of Midwifery in 1840; as an obstetrician his improvements and writings won him wide repute, which became European on his discovery of chloroform in 1847; was one of the Queen’s physicians, and was created a baronet in 1866; published “Obstetric Memoirs,” “Archaeological Essays,” &c. (1811-1870).

SIMROCK, KARL JOSEPH, German scholar and poet, born at Bonn; studied at Bonn and Berlin, where he became imbued with a love for old German literature, in connection with which he did his best-known work; modernised the “Nibelungen Lied” (1827), and after his withdrawal from the Prussian service gave himself to his favourite study, becoming professor of Old German in 1850, and popularising and stimulating inquiry into the old national writings by volumes of translations, collections of folk-songs, stories, &c.; was also author of several volumes of original poetry (1802-1876).

SIMS, GEORGE ROBERT, playwright and novelist, born in London; was for a number of years on the staff of Fun and a contributor to the Referee and Weekly Dispatch, making his mark by his humorous and pathetic Dagonet ballads and stories; has been a busy writer of popular plays (e. g.  “The Lights o’ London,” “The Romany Rye”) and novels (e. g.  “Rogues and Vagabonds,” “Dramas of Life"); contributed noteworthy letters to the Daily News on the condition of the London poor; b. 1847.

SIMSON, ROBERT, mathematician, born in Ayrshire; abandoned his intention of entering the Church and devoted himself to the congenial study of mathematics, of which he became professor in the old university at Glasgow (1711), a position he held for 50 years; was the author of the well-known “Elements of Euclid,” but is most celebrated as the first restorer of Euclid’s lost treatise on “Porisms” (1687-1768).

SINAI, MOUNT, one of a range of three mountains on the peninsula between the Gulf of Suez and the Gulf of Akaba, at the head of the Red Sea, and from the summit or slopes of which Moses is said to have received the Ten Commandments at the hands of Jehovah.

SINCERITY, in Carlyle’s ethics the one test of all worth in a human being, that he really with his whole soul means what he is saying and doing, and is courageously ready to front time and eternity on the stake.