90 



THE SECOND BOOK OF BOTANY. 



Your aim being simply to understand how, and 

 from what, each part of a compound pistil is formed, 

 you need not care for the clumsiness or shapelessness 

 of your manufactured ovary. 



Point out its cells. Its dissepiments. Explain 

 why they are double. Point out the dorsal and ven- 

 tral suture of each carpel of your syncarpous struct- 

 ure. Where should you look for ovules in this 

 pistil ? 



Fio. 166. 



FIG. 167. 



FIG. 168. 



Prepare a compound ovary by joining three leaves 

 at their margins, as seen in Fig. 168. In what part 

 of an ovary so formed are the leaf-margins? In 

 what part of the ovary would you look for the 

 ovules ? The theory of the pistil is important, because 

 it gives clear ideas of the varied and complex charac- 

 ters of ovaries ; and these characters are of the first 

 importance in classification. 



