SAL VI A 



19 



come to maturity before the pistil ; they shed their 

 pollen, and shrivel up before the stigma is mature. 



Fig. 16 represents a young flower of Salvia officinalis, 

 in which the stamens (a a) are mature, but not the pistil 

 (p), which, moreover, from its position, is untouched 



FIG. 16. 



FIG. 17. 



FIG. 18. 



FIG. 16. --Salvia officinalis. Section of a young flower. 

 FIG. 17. Ditto, visited by a bee. 

 FIG. 18. Ditto, older flower. 



by bees visiting the flower; as shown in Fig. 17. The 

 anthers, as they shed their pollen, gradually shrivel up ; 

 while, on the other hand, the pistil increases in length 

 and curves downwards, until it assumes the position 

 shown in Fig. 18, st, where, as is evident, it must come 



c 2 



