182 Principles of Plant Culture. 
B. Propagation by Detached Parts. 
This comprises two quite different modes of propagation, 
viz., by specialized buds, and by sections of the plant. 
a— Propagation by Specialized Buds. 
351. This includes propagation by bulbs, bulblets, corms 
and tubers. It is in a sense intermediate between propa- 
gation by parts intact (846), and by cuttings (358). The 
bud that is to form the future plant, though not having 
roots of its own, has been specially prepared by the parent, 
through an abundant food supply and a partially dormant 
condition of the protoplasm, to maintain a separate exist- 
ence, even under adverse conditions, and in due time, to 
develop into a plant. In these respects it resembles the 
seed, from which it differs, however, in 
the less dormant condition of its pro- 
toplasm, and in not being the product 
of sexual fecundation (341). 
Fig. 85. Fie. 86. 
Fig. 85. Bulb of the common onion, Allium cepa. B, buds. 
Fig. 86. Bulb of garlic, Allium sativum. It contains several smaller bulbs 
(cloves). ; 
Fig. 87. Bulb of wild lily. 
Fig. 88. Thesame divided lengthwise, showing buds, B. 
352. The Bulb is a very short stem containing a ter- 
minal bud which is inclosed in scales (128). The scales are - 
