HOT 



C 



HOY 



some extent are combined the tank 

 and pipe systems. The flow-pipe a is 

 put half its diameter into the channel 

 c, which, when tilled with water (or so 

 far as is necessary), gives off a vapour, 

 exactly proportionable to the heat of 

 the pipe and pit. 



The third requisition is produced by 

 the surrounding atmosphere and heat- 

 ing materials. The fourth is accom- 

 plished simply by lowering the upper 

 sash ; the cold air thus entering at the 

 top only, falls directly into the passage 

 B, and passes through the hot chamber 

 before coming in contact with the 

 plants. When the heat in the chamber 

 is i)5, in the open space over the bed 

 it is 71; in the bottom of the passage 

 only 60 ; and in the mould in the bed 

 it is 80. The amount of vapour is 

 regulated with the greatest facility, even 

 from the smallest quantity to the great- 

 est density. Gard. Chron. 



HOTHOUSE. See Stove. 



HOTTENTOT BREAD. Diosco'rca. 



HOTTENTOT CHEEKY. Cassi'ne mau- 

 roce'nia. 



HOTTENTOT FIG, Mesembrya'ntke- 

 mttm cthi'/c. 



HOTTO'NIA. Water Violet. (Named 

 after P. Hotton, a Dutch botanist. 

 Nat. ord., Primcworts [Primulaceffi]. 

 Linn., -Pentandria I-Monogynia.) 



A hardy aquatic or marsh plant. Divisions 

 in spring ; ponds or ditches. 



H. palu'stris (marsh). 1. Flesh. August. 

 England. 



HOT WAIX is a hollow wall, the in- 

 terior air being so heated by flues or 

 hot water as to keep the bricks of 

 which its faces are composed so warm 

 as to promote the ripening of the wood 

 and fruit trained against them. See 

 Wall (Fined), 



HOT WATER as a source of heat for 

 gardening purposes is preferable to any 

 other for large strucuires. In these it 

 is less expensive, and in all it is more 

 manageable and less troublesome than 

 any other. See Grcaikousi , Hotbed ', and 

 Stove, 



HOUJ.LK'TI.Y. (Named after M. 

 Honllct, a French gardener. Nat. ord., 

 Orchids [Orchidacea?]. Linn., 



nandria \-Monandria. Allied to Stan- 

 hopea.) 



Stove orchids. Division of the plant ; peat, 

 broken pots, charcoal, and rotten wood ; plants 

 elevated above the pot, or in a -shallow basket. 

 Summer temp., 60 to 90 ; winter, 50 to 60. 

 H. Brocklehurstia'na (Mr. Brocklehurst's). 2. 

 Brown, yellow. June. Brazil. 1841. 



vitta'ta (striped). 1. Brown, yellow. June. 



Brazil. 1841. 



HOUND'S TONGUE. Cynoglo'ssum. 



HOUSELEEK. Sempervi'vum. 



HOUSTO'NIA. (Named in honour of 

 Dr. TV. Houston, an English botanist. 

 Nat. ord., Cinchonads [Cinchonacece]. 

 Linn., -i-Tetrandria 1-Monogynia.') 



Hardy herbaceous perennials from North 

 America, Division in spring ; sandy loam and 

 peat ; beautiful for small beds and rockworks. 

 This genus should be added to Bouvardia. 

 H. ulbiflo'ra (white-flowered). White. June. 

 1823. 



ceeru'lea (blue). . Blue. June. 1/85. 



cilia' ta (hair-fringed). Whitish. July. 



longifo'lia (loner-leaved). $. Scarlet. 



purpu'rea (purple). 1. Purple. July. 1800. 



serpyllifo'lia(\VM-thyms- leaved). $. White. 



July. 1826. 



tene'lla (tender). Purple. May. 1812. 



HOUTTUV'NIA. (Named after Dr. 



Houttiiyn,. of Amsterdam. Nat. ord., 



Siiuninids [Saururacero], Linh., 3- 

 Triandria 3-Triqynia.') 



Herbaceous greenhouse marsh plant from 

 Japan, with yellowish green flowers. Seeds, or 

 dividing the plant in spring ; peat and loam, 

 kept moist, and the plant a little shaded. 

 Winter temp., 40 to 50. H. corda'ta is really 

 Polygonum cuspida'tum. 

 H.fte'tida (fetid). . July. 1800. 



HO'VEA. (Named after A. P. Hove, 

 a Polish botanist. Nat. ord., Leyu- 

 ininoiis Phtiiis. Linn., \Q-MotK id elphla 

 6-Decandrla. Allied to Lalage.) 



Greenhouse evergreen shrubs from New Hol- 

 land, with purple flowers except where other- 

 wise mentioned. Seeds, which should be sown 

 in a hotbed, and moistened in warm water 

 before sowing; cuttings of young side-shoots 

 in April or May, in sand, under a bell-glass, 

 and kept in a close frame ; sandy peat, with a 

 very little fibry loam, and pieces of charcoal, 

 and freestone, or small pieces of pounded 

 bricks. Winter temp., 40 to 48, with plenty 

 of air ; in summer they should be a little shaded 

 from bright sunshine. 

 H. Ce'lsii (Cels's). 4. Blue. June. 1818. 



cri'spa (curled). 2. February. 183/. 



elli'ptica (oval-leaved). 3. April. 1817. 



ilicifo'lia (Holly-leaved). 3. April. 1844. 



lunceola'ta (spear-head-/eawrf). 3. May. 



1805. 



lutifo'liu (broad-leaved). 3. June. 1820. 



