44 



THE KLOWEK 



a. The ovule is said to be erect when it grows from the base of the ovary 

 oscmt/mg-, when it grows from a little above the base jjJCTidM/ows, when it hangs 

 from the summit of the cavit/j and suspended ^\A\^n it hangs from a little below 

 the summit. 



90. In their early state, the ovtiles are quite soft, consisting of 

 two sacks or integuments, containing a pulpy mass, and open 

 only at their apex, where there is a passage left tln-ough both, 

 called the foramen. ; The outer integument is called the primine, 

 the other the (^ecM«(ii«e; and the central pulpy mass the nucCeus. 

 (Fig. 11; 8.) 



a. The foramen may be detected even in the perfect seed, by soaking it in 

 water, and then pressing out the fluid thus absorbed, which M'ill be seen to issue 

 from this little orifice. It has an important agency in the fertilization of the seed, 

 wliich at tins early j^eriod has no traces of the embryo (18). 



91. The stalk by which the ovule is connected to the pla- 

 centa, is caUed the funiculus, and its jooint of attachment to the 

 nucleus of the ovule, the chalaza. Through these the ovule 

 receives its nourislmient from the placenta. ( Fig. 11; 8, 9, ) 



§ 4. OF THE MUTUAL ACTION OF THE STAMENS AND PISTILS. 



92. The specific use of 

 the stamens and pistils is 

 the fertilization of the 

 seed\(57, 58). This ap- 

 pears to he effected in the 

 following manner. At the 

 proper season, the anthers 

 discharge the pollen con- 

 tained in then* cavities 

 liii' lilli!ililli!lll!llllli!lllllllillllllllillillli / tlirough their dehiscence 



FIG. 12. — 1, Section of the upper part of the style Or poreS, iuto the air. Some 

 of the snap-dragon, the pollen tubes passing down q^ j^ tllUS falls UDOll the 

 between the cells ; 2, 3, 4, 5, various forms of pollen, . . 



showing the tubes ; 6, pollen of the CEnotliera bienni.?, Stlgllia.; 

 one of its tubes descending among the cells of the style. 



a. The Author of nature makes special provision for the accomplishment of 

 this function. Thus the anthers are generally placed above the stigma, the 

 stamens being longer than the pistils when the flower is erect, as in the tulip, 

 and shorter, when it droops, as in several species of the lily. lu the mountain 



