Leaf cuttings are handled in the same manner as soft stem-cuttings so far as temperature and moisture are concerned. There are comparatively few species in which they form the most available means of multiplication. In some cases, variegation will not be reproduced by the rooted leaf. This is true in the ivy-leaved geranium L'Elegante; a good plant can be obtained, but it reverts to the plain-leaved type. CHAPTER V. GRAFTAGE. =Graftage.=--The process or operation of grafting or budding, or the state or condition of being grafted or budded. =Grafting.=--The operation of inserting a bud or a cion in a stock. It is commonly restricted to the operation of inserting cions of two or more buds, in distinction from budding, or the operation of inserting a single bud in the stock; but there are no essential differences between the two operations. =Stock.=--In graftage, a plant or part of a plant upon which a cion or bud is set. A _free stock_ is a seedling, in distinction from a grafted stock. =Cion or Scion.=--A portion of a plant which is mechanically inserted upon the same or another plant (stock) with the intention that it shall grow. GENERAL CONSIDERATIONS.--Graftage is rarely employed for the propagation of the species, as seedage and cuttage are more expeditious and cheaper. Its chief use is to perpetuate a variety which does not reproduce itself from seeds and which cannot be economically grown from cuttings. Nearly all the named varieties of tree fruits and many of those of ornamental trees and shrubs are perpetuated by means of graftage. In some species which present no marked varieties, however, propagation by seeds or cuttings is for various reasons so difficult or uncertain that recourse must be had to graftage. This is particularly true in many of the firs and spruces which do not produce seeds to any extent in cultivation. In other cases graftage is performed for the purpose of producing some radical change in the character or habit of the plants, as in the dwarfing of pears by grafting them upon the quince, the elevation of weeping tops by working them upon upright trunks, and the acceleration of fruit-bearing by setting cions in old plants. It is sometimes employed to aid the healing of wounds or to repair and fill out broken tops. And it has been used to make infertile plants fertile, by grafting in the missing sex in diœcious trees, or a variety with more potent pollen as practiced in some of the native plums. All these uses of graftage fall under three heads: 1. To perpetuate a variety. 2. To increase ease and speed of multiplication. 3. To produce some radical change in nature or habit of cion or stock.