cal collections of fluid.
Caffeine, which is far the best true diuretic, acts in nearly every way
mentioned above. Together with digitalis it is the most efficient remedy
for cardiac dropsy. A famous diuretic pill, known as Guy's pill,
consists of a grain each of mercurial pill, digitalis leaves and squill,
made up with extract of henbane. Digitalis, producing its diuretic
effect by its combined action on heart, vessels and kidneys, is much
used in the oedema of mitral disease, but must be avoided in chronic
Bright's disease, as it increases the tension of the pulse, already
often dangerously high. Turpentine and cantharides are not now
recommended as diuretics, as they are too irritating to the kidneys.

DIURNAL MOTION, the relative motion of the earth and the heavens, which
results from the rotation of our globe on its axis in a direction from
west toward east. The actual motion consists in this rotation. But the
term is commonly applied to the resultant apparent revolution of the
heavens from east to west, the axis of which passes through the
celestial poles, and is coincident in direction with the axis of the
earth.

DIVAN (Arabic _d[=i]w[=a]n_), a Persian word, derived probably from
Aramaic, meaning a "counting-house, office, bureau, tribunal"; thence,
on one side, the "account-books and registers" of such an office, and,
on another, the "room where the office or tribunal sits"; thence, again,
from "account-book, register," a "book containing the poems of an
author," arranged in a definite order (alphabetical according to the
rhyme-words), perhaps because of the saying, "Poetry is the register
(_d[=i]w[=a]n_) of the Arabs," and from "bureau, tribunal," "a long
seat, formed of a mattress laid against the side of the room, upon the
floor or upon a raised structure or frame, with cushions to lean
against" (Lane, _Lexicon_, 930 f.). All these meanings existed and
exist, especially "bureau, tribunal," "book of poems" and "seat"[1]; but
the order of derivation may have been slightly different. The word first
appears under the caliphate of Omar (A.D. 634-644). Great wealth, gained
from the Moslem conquests, was pouring into Medina, and a system of
business management and administration became necessary. This was copied
from the Persians and given the Persian name, "divan." Later, as the
state became more complicated, the term was extended over all the
government bureaus. The divan of the Sublime Porte was for