n
his appointment as keeper of prints and drawings in the British Museum.
His chief publications are lives of Landor (1881) and Keats (1887), in
the English Men of Letters series; the Edinburgh edition of R. L.
Stevenson's works (1894-1897); editions of the letters of Keats (1887),
and of the _Vailima Letters_ (1899), which R. L. Stevenson chiefly
addressed to him; _A Florentine Picture-Chronicle_ (1898), and _Early
History of Engraving in England_ (1905). But in the field both of art
and of literature, Mr Colvin's fine taste, wide knowledge and high
ideals made his authority and influence extend far beyond his published
work.

COLWYN BAY, a watering-place of Denbighshire, N. Wales, on the Irish
Sea, 40-1/2 m. from Chester by the London & North-Western railway. Pop. of
urban district of Colwyn Bay and Colwyn (1901) 8689. Colwyn Bay has
become a favourite bathing-place, being near to, and cheaper than, the
fashionable Llandudno, and being a centre for picturesque excursions.
Near it is Llaneilian village, famous for its "cursing well" (St
Eilian's, perhaps Aelianus'). The stream Colwyn joins the Gwynnant. The
name Colwyn is that of lords of Ardudwy; a Lord Colwyn of Ardudwy, in
the 10th century, is believed to have repaired Harlech castle, and is
considered the founder of one of the fifteen tribes of North Wales. Nant
Colwyn is on the road from Carnarvon to Beddgelert, beyond Llyn y gader
(gadair), "chair pool," and what tourists have fancifully called Pitt's
head, a roadside rock resembling, or thought to resemble, the great
statesman's profile. Near this is Llyn y dywarchen (sod pool), with a
floating island.

COLZA OIL, a non-drying oil obtained from the seeds of _Brassica
campestris_, var. _oleifera_, a variety of the plant which produces
Swedish turnips. Colza is extensively cultivated in France, Belgium,
Holland and Germany; and, especially in the first-named country, the
expression of the oil is an important industry. In commerce colza is
classed with rape oil, to which both in source and properties it is very
closely allied. It is a comparatively inodorous oil of a yellow colour,
having a specific gravity varying from 0.912 to 0.920. The cake left
after expression of the oil is a valuable feeding substance for cattle.
Colza oil is extensively used as a lubricant for machinery, and for
burning in lamps.

COMA (Gr. [Greek: koma], from [Greek: koiman], to put to sleep), a deep
sleep; the term i