DIS 



200 



DOU 



Three species. Green- 

 Division. Peat, loam, 



Two species. Half- 



buds protruded directly in the front of, DISEMMA. Two species. Stove 

 branches trained against wails, or fore- evergreen climbers. Cuttings, Loam 

 right shoots, as they are correctly term- , and peat. 

 ed,and buds that would produce shoots] DISPERIS. 

 in places already sufficiently filled with house orchids, 

 branches, may be removed, or disbud- and sand, 

 ded. The object is to strengthen the DISPORUM. 



desirably-placed buds by thus confining hardy herbaceous. Division and seed, 

 the expenditure of sap upon them. Peat and loam. 



There is no better mode of aiding a j DISSOLENX verticillata. Green- 

 weakly plant to a more vigorous and house evergreen shrub. Cuttings. Rich 

 robust growth than judicious disbud- light soil. 



ding ; but an over-robust and super- ! DITTANY. Origanum dictamnus. 

 luxuriant tree had better be allowed to j DIURIS. Eight species. Green- 

 exhaust itself by a profuse development house orchids. Division. Peat, loam, 

 of leaf buds. and sand. 



DISCHIDIA. Two species. Stove! DODECATHEON. Two species, and 

 evergreen trailers. Cuttings. Sandy , several varieties. Hardy herbaceous. 

 loam. ! Division. Light loam. See American 



DISEASES. Dr. Good, the distin-| Cowslip. 

 guished medical writer, has remarked, ! DOG- WOOD. Cornus. 

 that the morbid affections to which the j DOLICHOS. Sixteen species. The 

 vegetable part of the creation is liable, ' two green-house twiners, D. jacquinii 

 are almost as numerous as those which; and Ugnosus, are the only two worth 

 render decrepid and destroy the animal cultivating. Cuttings. Rich sandy loam, 

 tribes. It would be difficult, perhaps, j DOLIOCARPUS caZiwca. Stove ever- 

 whatever system of nosology is follow- green climber. Cuttings. Turfy loam 

 ed, to place a finger upon a class of and peat. 



animal physical diseases of which a pa- DOMBEYA. Six species. Stove 

 rallel example could not be pointed out [ evergreen trees. Cuttings. Sandy loam 

 among plants. The smut which ravages and peat. 



our corn crops; the mildew which de- DONDIA epipactris. Hardy herba- 

 stroys our peas ; the curl that is annually ceous. Seed or division. Loam and 

 infecting more destructively our pota- j peat. 



toes ; the ambury, or club-root, to which I DOODIA. Four species. Green- 

 cur turnips and other species of brassica house ferns. Division and seed. Loam 

 are liable; the shanking, or ulceration,! and peat. 



which attacks the stalks of our grapes, t DOROXICUM. Nine species. Hardy 

 are only a few of the most commonly herbaceous. Division. Common soil, 

 observed diseases to which the plants ' DORTMANNA. Two species. Har- 

 we cultivate are liable. '. dy herbaceous. Division. Peat. 



Disease is the negation of health ; DORYCNIUM. Eight species. Har- 

 and as the health of a plant is the cor- dy annual, herbaceous and evergreen, 

 rect performance of its functions, dis- Seed. Sandy loam, 

 ease may be defined to be an incorrect I DOUBLE FLOWERS. Hybridizing, 

 performance of the functions. Such i aided by cultivation, gives birth to these 

 incorrectness arises from four causes — [ objects of the gardener's care generally 

 vital energy declining from old age — 'designated double flowers, which are 

 parasites — improper food, either in qua- , such beauteous ornaments of our bor- 

 lity or quantity — and inauspicious tem- ders and parterres. To the uninitiated 

 perature. If these could be all avoided, it seems incredible that the double moss 

 a plant might enjoy a vigorous immor- rose should be a legitimate descendant 

 tality. Such, however, is not the lot of | from the briar; neither do the flowers 

 any organized being, and in proportion of the Fair Maid of France appear less 

 to the debilitating circumstances are , impossible derivatives from those of the 

 the nature, the intensity, and final con- i Ranunculus platanif alius ; nor bache- 

 sequences of the disease induced. The | lors' buttons from the common butter- 

 little known relative to the diseases cup; yet so they are. Double flowers, 

 which infest the gardeners' crops, will j as they are popularly called, are more 

 be found under their respective titles. ' correctly discriminated as the full flow- 



