[ 



Hardy annuals. Seeds in the Open ground 

 any time after the middle of March. 

 N. arista'tu (awned), 2, Blue. August. 

 Athens. 



cilia'ris (hair-fringed). 1. Yellow. July. 



Levant. 



CQrnimlu'tti (small-horned). 1. Yellow. 



July. 1820. 



damasce'na (damask). l. Lilac, blue. 



July. South Europe. 15/0. 



. flo're ple'no (double-flowered). 



14. Lilac, blue. July. South Europe. 

 15/0. 



Hispa'nica (Spanish). l. Brown, white. 



July. Spain. 1629. 



orienta'lls (eastern). l. Yellow. July. 



Syria. 1699. 



aati'va (cultivated). lj. Yellow. July. 



Egypt. 1548. 

 citri'nu (citron -coloured-seerfed). 1$. 



Pale blue. July. South Europe. 

 Cre'tica (Cretan). l. Pale blue. 



July. Crete. 

 I'ndica (Indian). 1. Pale blue. 



July. East Indies. 



NIGHTSHADE. Sola'mtm. 

 NIGHT-SOIL. See Dung. 

 NIGHT TEMPERATURE in hothouses, 

 greenhouses, and frames, should always 

 average from 10 to 20 lower than the 

 temperature in which the plants are 

 grown during the day. It is in the 

 night that the individual functions are 

 renovated by a temporary repose, and 

 if left to the dictates of healthy nature, 

 the sap, like the blood, rises at night 

 with a much diminished velocity. 



That plants do become exhausted by 

 too unremitting excitement, is proved 

 to every gardener who has peach- 

 houses under his rule; for if the 

 greatest care be not taken to ripen the 

 wood by exposure to the air and light 

 during the summer, no peach tree will 

 be fruitful if forced during a second 

 successive winter, but will require a 

 much more increased temperature than 

 at first to excite it even to any advance 

 in vegetation. 



The experiments of Harting and 

 Munter upon vines growing in the 

 open air, and those of Dr. Lindley 

 upon vines in a hothouse, coincide in 

 testifying that this tree grows most 

 during the less light and cooler hours 

 of the twenty-four. But the hours of 

 total darkness were the period when 

 the vine grew slowest. This, observes 

 Dr. Lindley, seems to show the danger 

 of employing a high night temperature, 

 which forces such plants into growing 



7 ] NIP 



fast at a time when nature bids them 

 repose. 



That the elevation of temperature at 

 night does hurtfully excite plants is 

 proved by the fact, that the branch of 

 a vine kept at that period of the day in 

 temperature not higher than 50, in- 

 hales from one-sixteenth to one-tenth 

 less oxygen that a similar branch of 

 the same vein during the same night 

 in a temperature of 75. The exhala- 

 tion of moisture and carbonic acid, is 

 also proportionably increased by the 

 higher temperature. 



NI'PA. (The Molucean name. Nat. 

 ord., Palms [Palmacese]. Linn., 21- 

 Monceda 10-Monadelphlu.) 



Stove palm. Seeds in a strong moist heat, 

 not giving too much moisture to the seed at 

 first ; rich loam. Winter temp., 60 to 65 ; 

 summer, 60 to 90, and moist atmosphere. 

 N.fru'ticans (shrubby). 10. White. East 

 Indies. 1822. 



NIPH^'A. (From nipfios, snow ; snow- 

 white flowers. Nat. ord., Gesnerworts 

 [Gesneraceee]. Linn., l-Didynamia 

 2-Ang-iospermia. Allied to Achimenes.) 



Stove herbaceous, white-flowered perennials. 

 Divisions of the roots as growth commences in 

 the spring ; sandy loam and peat, enriched with 

 leaf-mould or rotten cow-dung. Temp., when 

 at rest, 40 to 45 ; when starting and potted, 

 55 to 70 ; when growing, 60 to 75 ; when 

 flowering, rather less ; until after flowering they 

 are allowed to become nearly dry, when a low 

 temperature suits them. 



N. a'lbo-linea'ta (white-lined-teaoed). . Sep- 

 tember. New Grenada. 1844. 



oblo'nga (oblong). . September. Guate- 



mala. 1841. 



ru'bra (red-haired). $. November. 1846. 



NIPHO'BOLUS. ( From niphobolus, 

 covered with snow ; referring to the 

 white covering of the spore-cases. Nat. 

 ord., Ferns [Polypodiaceee]. Linn., 

 2-Cryptogamia I-Filices.) 



Stove Ferns, with brown spores. See Ferns. 

 N. ucrostichoi'des (Acrostichum-like). Septem- 

 ber. Isle of Luzon. 



adna'scens (stem-leaf-pressed), i. May. 



East Indies. 1824. 



a'lbicans (whitish). 1. July. Ceylon. 



bi' color (two-coloured). August. Malacca. 



co'nfluens (running -together). . May. 



New Holland. 1820. 



costa'tus (ribbed-teaued). July. Ceylon. 



1824. 



flocculo'sus (woolly- tufted). August. Manilla. 



1841. 



gla'ber (smooth). July. Malacca. 



Kneu're ^narrow -leaved). . May. Japan. 



1852. 



