SECT. I. ORGANOGRAPHY AND GLOSSOLOGY. 91 



be found in the same flower, or even in different flowers 

 seated on the same individual plant ; but unless both 

 exist, and can be subjected to a mutual influence, the fer- 

 tility of the seed is never secured. A more accurate notion 

 of these several whorls may be obtained, if we now exa- 

 mine the blossoms of a common ranunculus in greater 

 detail (fig. 89- a). Here, the outermost whorl of the 



perianth consists of five parts, of a greenish yellow 

 colour, and is sufficiently distinguished from the next 

 whorl, to admit of its receiving a specific appellation ; 

 it is therefore termed the " calyx " (5) ; whilst its 

 subordinate parts are called " sepals." The five parts 

 which compose the next whorl are of a bright yellow 

 colour, and are termed " petals " (c), or, collectively, 

 the " corolla." The calyx rarely consists of more than 

 one whorl of sepals, but the corolla is frequently com- 

 posed of more than one. Next, within these, are 

 several whorls of " stamens," one of which is repre- 

 sented at (rf). These are the fertilising organs of 

 the flower, composed of threadlike stems, surmounted 

 by oval cells, or pouches, which contain a fine powder, 

 named pollen. Lastly, we have several whorls of 

 " carpels" (e), which are little ovate bodies, containing 

 the " ovule," or young seed. The carpels, like the 

 sepals, are not often ranged in more than one whorl, 

 though they are so in this instance ; but the stamens 

 frequently occupy several. When the carpels adhere 



