i , Shee 
(Vie £ m 
The External Form of Plants. 81 
called a corm (Fig. 121); or it may be comparatively small 
in proportion to the mass of the leaves, as in the onion [or 
Fic. 119.—Double tuber, a, 4, of Fic. 120.—Double palmate tuber, a, 0, 
Orchts Morio. of Orchis odoratissima. 
hyacinth] (Fig. 122). Further characters are derived from 
the character of the scales : and bulbs are hence termed scaly 
Fic. 121.—Corm of Gladiolus segetum: a longitudinal section ; a last year’s, & this 
year’s bulb ; ¢ scape ; d scales; x roots ; Bafter removal of the enveloping scales ; 
y bud which will develop Into next year’s bud; z bulbil. 
G 
