BUD-PKOPA<;.ATIOX 



21 



31. Bulblet of 

 tiger lily. 



57. Natural Cuttings. — Sometimes cuttings occur with- 

 out the aid of man. Some kinds of willows shed their twigs, 

 or the storms break them off: many of these twigs take 

 root in the moist earth where willows grow, and 

 they are often carried down the streams and are 

 washed along the shores of lakes. Observe the wil- 

 lows along a brook, and determine whether any of 

 them may have come down the stream. 



58. Propagation by Means of Leaves. — 

 Even leaves may take root and give rise to 

 new plants. There are examples in warm 

 countries. The lake-cress of northern streams 

 *also propagates in this way: the leaves with 

 little plants attached may often be seen float- 

 ing down stream. Gardeners propagate some 

 kinds of begonias by means of leaf -cutting; 

 also gloxinias and bryophyllums. (Paragraph 69.) 



59. Propagation by Means of 

 Buds. — Buds often become detached 

 and propagate the plant. Familiar 

 examples are the bulblets of tiger 

 lilies, borne amongst the foliage; for 

 all bulblets and bulbs are only 

 special kinds of buds. Fig. 31. 

 Some water plants make heavy 

 winter buds, which become de- 

 tached on the approach of cold 

 weather and sink to the bottom. 

 In spring, they give rise to new 

 plants. 



60. Grafts. — Sometimes a plant 

 may unite with another plant. A 

 branch or a trunk may lie against 

 another plant of the same kind, or of 

 a very closely related kind, and grow 



