d other similar compositions he displays considerable
skill and talent, and some of his glees retain their popularity at the
present day. In 1787 Callcott helped Dr Arnold and others to form the
"Glee Club." In 1789 he became one of the two organists at St Paul's,
Covent Garden, and from 1793 to 1802 he was organist to the Asylum for
Female Orphans. As an instrumental composer Callcott never succeeded,
not even after he had taken lessons from Haydn. But of far greater
importance than his compositions are his theoretical writings. His
_Musical Grammar_, published in 1806 (3rd ed., 1817), was long
considered the standard English work of musical instruction, and in
spite of its being antiquated when compared with modern standards, it
remains a scholarly and lucid treatment of the rudiments of the art.
Callcott was a much-esteemed teacher of music for many years. In 1800 he
took his degree of Mus.D. at Oxford, where fifteen years earlier he had
received his degree of bachelor of music, and in 1805 he succeeded Dr
Crotch as musical lecturer at the Royal Institution. Towards the end of
his life his artistic career was twice interrupted by the failure of his
mental powers. He died at Bristol after much suffering on the 15th of
May 1821. A posthumous collection of his most favourite vocal pieces was
published in 1824 with a memoir of his life by his son-in-law, William
Horsley, himself a composer of note.

Callcott's son, WILLIAM HUTCHINS CALLCOTT (1807-1882), inherited to a
large extent the musical gifts of his father. His song, "The last man,"
and his anthem, "Give peace in our time, O Lord," were his best-known
compositions.

CALLIAS, tyrant of Chalcis in Euboea. With the assistance of Philip II.
of Macedon, which he hoped to obtain, he contemplated the subjugation of
the whole island. But finding that Philip was unwilling to help him,
Callias had recourse to the Athenians, although he had previously (350
B.C.) been engaged in hostilities with them. With the support of
Demosthenes, he was enabled to conclude an alliance with Athens, and the
tribute formerly paid by Eretria and Oreus to Athens was handed over to
him. But his plan of uniting the whole of Euboea under his rule, with
Chalcis as capital, was frustrated by Philip, who set up tyrants chosen
by himself at Eretria and Oreus. Subsequently, when Philip's attention
was engaged upon Thrace, the Athenians in conjunction with Callias drove
out these tyrants, and Cal