SECT. I. OKGANOGRAPHY AND GLOSSOLOGY. 



57 



cabbage), the effect is produced on a part of the stem 

 which is entirely above ground. 



(6'5.) Bulbs. The buds of some plants are subject 

 to a peculiar modification. Instead of expanding into 

 branches and leaves, in the usual way, the rudimentary 

 parts of which they consist, become depositaries of 

 nutriment, swelling preternaturally, but still conti- 

 nuing in a condensed or undeveloped form. In this state 

 they are termed " bulbs ;" and are sometimes found 

 on the stems, and in the axils of the leaves, as in the 

 Orange-lily (Lilium bulbiferum) ; and even among 

 heads of flowers, as in a variety of the common 

 onion. The bulbs, however, with which we are most 

 familiar, as of lilies, hyacinths, onions, &c., contain 

 the whole of the ascending organs of these plants in 

 a condensed form, with their roots proceeding from a 

 flat disk below (fig. 49.). The chief differences among 



bulbs depend upon the rudimentary leaves of which 

 they are composed, being either in the form of succulent 

 or fleshy scales (a), as in the lily ; or in concentric 

 coats (b) which completely surround the axis, as in 



