60 
ORGANOGRAPHY. 
BOOK I. 
older botanists; Adnatum of Richard;) which grow at the ex- 
pense of their parent bulb, and eventually destroy it. Every 
true bulb is, therefore, necessarily formed of imbricated scales, 
and a solid bulb has no existence. The hulhi soUdi, as 
they have been called, of the Crocus, the Colchicum, and 
others, are, as we shall hereafter see (see Cormus), a kind of 
subterranean stem : they are distinct from the bulb in being, 
not an imbricated scaly bud, but a solid fleshy stem, itself 
emitting buds. It has been supposed that they were buds, 
the scales of which had become consolidated ; but this h}^o- 
thesis leads to this very inadmissible conclusion, — that as the 
cormus or solid bulb of a Crocus is essentially the same, ex- 
cept in size and situation, as the stem of a Palm, the stem of 
a Palm must be a solid bulb also, which is absurd. In truth, 
the bulb is analogous to the bud that is seated upon the cor- 
mus, and not to the cormus itself; a bulb being an enlarged 
subterranean bud without a stem, the cormus a subterranean 
stem with buds on its surface. 
20 21 22 
Of the bulb, properly so called, there are two kinds. 
1. The tunicated hulb (fig. 20.), of which the outer scales are 
thin and membranous, and cohere in the form of a distinct 
covering, as in the onion; and, 2. the naked bulb (Bulbus 
squamosus) (fig. 21. 22.), in which the outer scales are not 
membranous and united, but distinct and fleshy like the inner 
scales, as in Lilium. The outer covering of a bulb of the 
first kind is called the tunic. 
