gus_, and in one passage St Columba speaks of Christ
as his Druid.

See D'Arbois de Jubainville, _Les Druides et les dieux celtiques a
forme d'animaux_ (Paris, 1906), and _Introduction a l'etude de la
litterature celtique_ (Paris, 1883); P. W. Joyce, _A Social History of
Ancient Ireland_ (London, 1903). (E. C. Q.)

DRUIDS, ORDER OF, a friendly society founded, as an imitation of the
ancient Druids, in London in 1781. They adopted Masonic rites and spread
to America (1833) and Australia. Their lodges are called "Groves." In
1872 the Order was introduced into Germany. (See FRIENDLY SOCIETIES.)

DRUM (early forms _drome_ or _dromme_, a word common to many Teut.
languages, cf. Dan. _tromme_, Ger. _Trommel_: the word is ultimately the
same as "trumpet," and is probably onomatopoeic in origin; it appears
late in Eng. about the middle of the 16th century), the name given to
the well-known musical instrument (see below) and also to many objects
resembling it in shape. Thus it is used of any receptacle of similar
shape, as a "drum" of oil, &c.; in machinery, of a revolving cylinder,
round which belting is passed; of the _tympanum_ or cylindrically shaped
middle ear, and specially of the membrane that closes the external
auditory meatus; and, in architecture, of the substructure of a dome
when raised to some height above the pendentives. The architectural drum
had a twofold object; first, to give greater elevation to the dome
externally so that it should rise well above the surrounding building,
and secondly, to allow of the interior being lighted with vertical
windows cut in the drum, instead of forming penetrations in the dome
itself, as in St Sophia, Constantinople. The term is also applied to the
circular blocks of stone, which in columns of large dimensions were
built with a series of drums. At Selinus in Sicily some of these great
circular blocks are found on the road between the quarries and the
temples; they vary from 8 to 10 ft. in diameter, being about 6 ft. high.
The term _frusta_ is sometimes applied to them.

In music the drum (Fr. _tambour_; Ger. _Trommel_; Ital. _tamburo_) is an
instrument of percussion common in some form to all nations and ages. It
consists of a frame or vessel forming a resonant cavity, over one or
both ends of which is stretched a skin or vellum set in vibration by
direct percussion of hand or stick. Drums fall into two divisions
according to the nature of their sonor