Its internal action is also that of its class, but its
marked contact properties make it specially useful in gastriatony and
flatulence, and sometimes in hysteria.

CAYEY, an inland district and mountain town of the department of
Guayama, Porto Rico, celebrated for its cool, invigorating climate and
the beauty of its scenery. Pop. (1899) of the town, 3763; of the
district, 14,442. The town is surrounded by mountain summits, the
highest of which, El Torito, rises to an elevation of 2362 ft. above
sea-level. It was made a military post by the Spaniards and used as an
acclimatizing station. The old Spanish barracks have been enlarged and
improved by the American military authorities and, under the name of
"Henry Barracks," are used for the same purpose. The town is a popular
summer resort for residents of the coast cities. The surrounding country
is wooded and very fertile, being especially noted for its coffee and
tobacco. The town has large cigar factories. Cayey is connected with
Guayama by an excellent military road.

CAYLEY, ARTHUR (1821-1895), English mathematician, was born at Richmond,
in Surrey, on the 16th of August 1821, the second son of Henry Cayley, a
Russian merchant, and Maria Antonia Doughty. His father, Henry Cayley,
retired from business in 1829 and settled in Blackheath, where Arthur
was sent to a private school kept by the Rev. G.B.F. Potticary; at the
age of fourteen he was transferred to King's College school, London. He
soon showed that he was a boy of great capacity, and in particular that
he was possessed of remarkable mathematical ability. On the advice of
the school authorities he was entered at Trinity College, Cambridge, as
a pensioner. He was there coached by William Hopkins of Peterhouse, was
admitted a scholar of the college in May 1840, and graduated as senior
wrangler in 1842, and obtained the first Smith's Prize at the next
examination. In 1842, also, he was elected a fellow of Trinity, and
became a major fellow in 1845, the year in which he proceeded to the
M.A. degree. He was assistant tutor of Trinity for three years. In 1846,
having decided to adopt the law as a profession, he left Cambridge,
entered at Lincoln's Inn, and became a pupil of the conveyancer Mr
Christie. He was called to the bar in 1849, and remained at the bar
fourteen years, till 1863, when he was elected to the new Sadlerian
chair of pure mathematics in the university of Cambridge. He settled at
Cambrid