. Plant propagation : greenhouse and nursery practice . Plant propagation. icxi'i-;kl.\u:.\ IS and ir,i The conditions of success ot grafts are of two kinds, extrinsic (conditions independent of the nature of the plant—as soil, tem- perature, etc.) and intrinsic (conditions dependent upon the peculiar nature of the plants grafted, as method of cicatrization, analog^' and botanical relations. The extrinsic conditions neces- sary to observe by approach are: 1, A temperature suf- ficient to produce primary tissue; 2, prevention of all conditions which cause rotting or drying
. Plant propagation : greenhouse and nursery practice . Plant propagation. icxi'i-;kl.\u:.\ IS and ir,i The conditions of success ot grafts are of two kinds, extrinsic (conditions independent of the nature of the plant—as soil, tem- perature, etc.) and intrinsic (conditions dependent upon the peculiar nature of the plants grafted, as method of cicatrization, analog^' and botanical relations. The extrinsic conditions neces- sary to observe by approach are: 1, A temperature suf- ficient to produce primary tissue; 2, prevention of all conditions which cause rotting or drying of the cicatrized meristem (pri- ' tissue) ; and 3, maintenance of adherence of the wounds by the aid of Ugatures susceptible of being loosened progressively with the growth of the plant. 211. Cicatrization.—Plants cicatrize their wounds either by simple drying of the cut tissues and neighboring cells or by regeneration of tissues by the aid of the primary tissue. All methods have failed with the mono- cotyledons and crj'ptogams experi- mented upon. Hence Daniel concludes that grafting by approach is impos- sible with plants that cicatrize their wounds by desiccation of the wounded cells and neighboring tissues; i. e., are incapable of regenerating tissue. In order to learn whether only plants with cambium may be grafted, as generally believed, Daniel worked with many monocots and cryptogams and secured a perfect cicatrization b}' the tongue graft with gladiolus, day lily {Funkia cordata), Caladium, white lily (Globba coccinea) and others, even with one of the club mosses (Sclaginclla arborca). The success of these grafts shows that grafting by approach is possible with certain monocots and that the presence of the cambium layer is not always necessary to the success of all grafts by approach. 212. Analogy.—The difference in hardness and the histological nature of woods may not be an obstacle to anatomical union. A natural, distinct cicatrization occurred
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