thout sleeves,
extending from the neck to a little below the waist, worn by men of all
ranks and ages from the 14th century to the time of Charles II., when
it began to be superseded by coat and waistcoat. The doublet was
introduced into England from France, and was originally padded for
defence or warmth. "Doublet" is also used of a pair or couple--a thing
that is the facsimile of another; as in philology, one of two words
differing in form, but represented by an identical root, as "alarm" or
"alarum"; in optics, of a pair of lenses, combined, for example, to
correct aberration. In the work of the lapidary a doublet is a
counterfeit gem, made by cementing two pieces of plain glass or crystal
on each side of a layer of glass (coloured to represent the stone
counterfeited); a thin portion of a genuine stone may be cemented upon
an inferior one, as a layer of diamond upon a topaz, or ruby on a
garnet.

DOUBS, a river of eastern France, rising in the Jura at the foot of the
Noirmont ridge at a height of 3074 ft. and flowing into the Saone. Its
course is 269 m. in length, though the distance from its source to its
mouth is only 56 m. in direct line; its basin has an area of 3020 sq. m.
Flowing N.E. the river traverses the lake of St Point and passes
Pontarlier; thenceforth its course lies chiefly through wooded gorges of
great grandeur. After skirting the town of Morteau, below which it
expands into the picturesque lake of Chaillexon and descends over the
Falls of the Doubs (88 ft. in height), the river for about 28 m. forms
the frontier between France and Switzerland. Flowing into the latter
country for a short distance, it turns abruptly west, then north, and
finally at Voujeaucourt, south-west. Just below that town the river is
joined by the canal from the Rhone to the Rhine, to accommodate which
its course has been canalized as far as Dole. Till it reaches Besancon
which lies on a peninsula formed by the river, the Doubs passes no town
of importance except Pontarlier. Some distance below Besancon it enters
the department of Jura, passes Dole, and leaving the region of hill and
mountain, issues into a wide plain. Traversing this, it receives the
waters of the Loue, its chief affluent, and broadening out to a width of
260 ft., at length reaches the Saone at Verdun. Below Dole the river is
navigable only for some 8 m. above its mouth.

DOUBS, a frontier department of eastern France, formed in 1790 of the
anci