CHAP. II. 
STEM. 
77 
leaf-bud of a root ; but in this he was partly mistaken, roots 
being essentially characterised by the absence of buds. He 
was, however, perfectly correct in identifying it with a leaf- 
bud. A bulb has the power of propagating itself by deve- 
loping in the axils of its scales new bulbs, or what gardeners 
call cloves, (Nucleus and Aclnascens of the older botanists ; 
Adnatum of Richard ;) which grow at the expense 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 solidi, 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 bulb, 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 hypothesis leads to this 
very inadmissible conclusion, — that as the cormus or solid 
bulb of a Crocus is essentially the same, except 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 ana- 
logous to the bud that is seated upon the cormus, 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. 
21 22 23 
Of the bulb, properly so called, there are two kinds. 
I. The tunicated hulh (j^^. 21.), of which the outer scales 
