SPARKS, JAMES, president of Harvard University, born in Connecticut; bred a carpenter, took to study, attended Harvard, where he graduated, studied theology, and became Unitarian, becoming a minister in that body, but retired from the ministry and settled in Boston; edited the North American Review; wrote and edited biographies of eminent Americans, and edited the writings of Benjamin Franklin and George Washington (1789-1866).

SPARTA or LACEDEMON, the capital of ancient Laconia, in the Peloponnesus, on the right bank of the Eurotas, 20 m. from the sea; was 6 m. in circumference, consisted of several distinct quarters, originally separate villages, never united into a regular town; was never surrounded by walls, its walls being the bravery of its citizens; its mythical founder was Lacedemon, who called the city Sparta from the name of his wife; one of its early kings was Menelaus, the husband of Helen; LYCURGUS (q. v.) was its law-giver; its policy was aggressive, and its sway gradually extended over the whole Peloponnesus, to the extinction at the end of the Peloponnesian War of the rival power of Athens, which for a time rose to the ascendency, and its unquestioned supremacy thereafter for 30 years, when all Greece was overborne by the Macedonian power.

SPARTACUS, leader of the revolt of the slaves at Rome, which broke out about 73 B.C.; was a Thracian by birth, a man of powerful physique, in succession a shepherd, a soldier, and a captain of banditti; was in one of his predatory expeditions taken prisoner and sold to a trainer of gladiators, and became one of his slaves; persuaded his fellow-slaves to attempt their freedom, and became their chief and that of other runaways who joined them; for two years they defied and defeated one Roman army after another sent to crush them, and laid Italy waste, till at the end of that time Licinius Crassus, taking up arms in earnest, overpowered them in a decisive battle at the river Silarus, in which Spartacus was slain.

SPASMODIC SCHOOL, name given to a small group of minor poets about the middle of the 19th century, represented by Philips, James Bailey, Sydney Dobell, and Alexander Smith, from their strenuous, overstrained, and unnatural style.

SPECIFIC GRAVITY, the weight of a body compared with another of equal bulk taken as a standard, such as the weight of a cubic inch of water.

SPECTRUM, the name given to coloured and other rays of pure light separated by refraction in its transmission through a prism, as exhibited on a screen in a darkened chamber.

SPECTRUM ANALYSIS, name given to the method of determining the composition of a body by means of the spectrum of light which it gives forth or passes through it, founded on the principle that a substance powerfully absorbs exactly the rays it radiates, and every substance has its own absorbing powers; or it may be defined the method of distinguishing different kinds of matter by their properties in relation to light.