= 
DIGGING. 
smell, like lemon-peel, when rub- 
bed, and the plant emits a phos- 
phoric vapour, which may be easily 
ignited by a candle, and burns like 
gas. The flowers are very orna- 
mental; and the plants will grow 
in any common garden soil, and in 
any situation not immediately under 
the drip of trees. They are in- 
creased by division of the root. 
Dini'scus. — Umbeliifere. — The 
beautiful Australian plants, some- 
times called by this name, and some- 
times by that of Trachyméne, are 
half-hardy annuals, that require to 
be raised on a hotbed, and not plant- 
ed out till May or June. In very 
cold, exposed situations, they are 
generally grown in pots, and kept 
in the greenhouse; but they never 
189 
| 
DION AA. 
could vegetate, nor trees grow. 
Digging (or ploughing, which is the 
same thing on a larger scale) is the 
| first operation performed by man on 
a barren waste when he takes it in- 
to cultivation. 
Dicira‘uis. — Scrophulérine. — 
The Foxglove. If this plant were 
not a common British weed, it would 
be thought very ornamental; and, 
in fact, the Teneriffe species, D. 
canariénsis, L., (Isopléxis cana- 
riénsis, G. Don), with yellow flow- 
ers, and D. scéptrum, L., (I. scép- 
trum, G. Don), with orange flowers, 
are favourite greenhouse shrubs. 
They should be grown in a mixture 
of loam and peat, and may be pro- 
pagated by cuttings or seeds which 
they ripen in abundance. The hardy 
flower so well as in the open ground. | herbaceous species which modern 
The best way to grow them is to| botanists have left in the genus Di- 
sow the seed in autumn as soon as 
it can be procured from the seed- 
shops, on a slight hotbed, to pot the 
plants as soon as they have formed 
their second pair of leaves, and to 
keep the pots in a frame or green- 
house, shifting the plants occasion- 
ally, till the following spring, when 
they may be planted in the open 
ground in @ light rich soil, and they 
will flower beautifully. 
Die'tytrs.— Fumaridcee. — The 
hew name given to several kinds 
of Fumaria; as, for example, F. 
eximia, F. formosa, &c. 
Diervi'Lua.— Caprifolidcee.— A 
little North American shrub, with 
yellow flowe’s, something like those 
of the honeysuckle in shape. It 
was formerly considered to belong 
to Lonicera. It is very hardy, and 
will grow in almost any soil or situ- 
ation, sending up abundance of suck- 
ers, by which it is easily increased. 
Diceinc.—The art of pulverizing 
the ground so as to reduce it toa 
fit state to be penetrated by the 
roots of plants; and also to render 
it pervious to the rain and air, with- 
out the aid of which neither seeds 
gitalis, are mostly natives of the 
south of Europe, and are all orna- 
mental. They require a hght rich 
soil, and are propagated by seeds. 
Ditiwy'nia. — Leguminose. — 
Australian shrubs with heath-like 
leaves, and pea flowers, which are 
generally scarlet and orange. They 
should be grown in pots well drain- 
ed, and in a mixture of peat, loam, 
and sand, and they should be well 
and regularly watered ; but no wa- 
ter should ever be allowed to siand 
in the saucers if their pots should 
have any, but they are much better 
without. They are propagated by 
cuttings, which should be struck in 
sand under a bell-glass. 
Dimorpyo'tHEeEcA.—Composite.— 
Professor De Candolle’s new name 
for the Cape Marigolds, formerly 
called Calendula pluvidlis and C. 
hy' brida—See Cau'EnDuLA. 
Dion#{\s.— Proserdcee.—Venus’s 
Fly-trap. A curious little American 
plant, nearly allied to the common 
Sun-dew, so often found in boggy 
meadows in different parts of Eng- 
land.—(See Dro'sera.) Dione‘a 
muscipula has a scaly root, almost 
