THRIFT. 
ducing tea, than from any real 
beauty they possess. 
HEorRO'MA. — Byttneridcec. — 
The Cocoa-nut Tree. ‘The trce, 
from the nuts of which cocoa and 
chocolate are prepared, comes very 
appropriately after the Tea ‘Tree. 
‘There are three species, all natives 
of South America, with brownish 
flowers ; all of which require a stove 
in England, and should be grown in 
light rich soil. 
“Taeopura’sTA. — Apocy'nee. — 
Stove plants with very handsome 
leaves and white flowers. They are 
grown in loam and peat, and they 
are propagated by cuttings. 
THERMOMETER. — No amateur 
should attempt to grow plants in a 
greenhouse or stove, or even in a 
hotbed, without being provided with 
a thermometer to regulate the degree 
of heat. A very ingenious one with 
a long tube for plungi: ng into the 
ground, has been contrived for as- 
certaining the heat of a hotbed or 
tan-pit. 
Tuermo’psis. — Legumindse. — 
Herbaceous plants with yellow flow- 
ers, naive Europe and North 
America, which should be grown in 
very rich soil, but which are quite 
hardy in the open air in Britain. 
There is one ligneous species, T'her- 
mopsis laburnifolia, D. Don, (Ana- 
gy ris indica, Willd.,) but it is now 
generally called Piptanthus nepa- 
lénsis. (See Pipra'ntuus.) None 
of the species belonging to this ge- 
nus will thrive unless they are grown 
in.very rich mould. 
TuisTLeE.—See Ca’rpvuus. 
Tuoma'sia. — Bytineridcee. — 
Pretty little Australian shrubs, for- 
merly called Lasiopétalum. They 
‘should be grown in sandy peat, and 
kept in a greenhouse. 
THoRN AppLe.—See Daru‘ra and 
STRAMO'NIUM. 
Tur rt.—Sidtice Arméiria, Lin.; 
Armeria vulgaris, Willd—Sece Ar- 
ME'RIA. 
hs 
. | whee 
+ 
392 
THUSA. 
Turirs.— Very small flies, not 
above My in lengih, and which 
seem rather to leap than to fly away 
when it is attempted to catch them ; 
throwing up the lower part ef their 
bodies at the same time, as though 
they curled themselves up to take a 
spring. ‘They are very destructive, 
and attack both leaves and petals, 
causing both to curl up, and after- 
wards to turn yellow and drop off. 
The larve are nearly as large as the 
perfect insect, and of a pale yellow; 
and the insect itself is first yellow- 
ish, but afterwards becomes black. 
As soon as the rayages of these 
little creatures are perceived, 
plants they have attacked oui 
well and frequently syringed, 
exposed as much as possible to the 
free air; hand-picking in their case 
being of little avail, from the very 
small size of the insects and their 
extraordinary activity. 
Trroatwort.—See TRACHE'LIUM. 
Tuu‘sa.— Conifere.—The Arbor 
Vite. ‘There are two kinds of Arbor 
Vitze common in British gardens, the 
American (Thija occidentilis), and 
the Chinese (J’. orientdlis), both 
having several varieties. rhe 
rican species is an open-growing tree, 
with horizontal branches; and in 
America, where it is called the 
White Cedar, it grows in swamps. 
The Chinese Arbor Vite, on the 
contrary, is a close-growing tree, 
with upright branches, and should 
be grown in a dry soil. Both are 
quite hardy in the climate of Londen, 
and both are propagated by layers 
and cuttings ; the former taking two 
years to root, and the latter being 
very difficult to strike. Besides these 
there are several other species, most 
of which require a greenhouse or 
protection during winter. The prin- 
cipal of these are Thija pendula 
and T’, articulata, Desf. (Callitris 
quadrivatvis, Veut.); the latter 
species, which is a native of Mount 
Atlas, in Barbary, producing the 
