REPRODUCTION 



21 



As the ultimate outcome of this process we find, on the 

 one hand, a parent-organism, and within the body of that 

 parent definite cells the germ-cells from which the 

 development of the new progeny takes its origin. In the 

 highest form each parent organism forms germ-cells of a 



FIG. 14. DIAGRAM OF A FLOWER. 

 (After Prantl.) 



Ke, calix ; K, corolla ; /, stamen ; 

 a, anther with pollen (p) ; F, ovary; 

 g, pistil ; 5, ovule ; em, embryo 

 sac ; *', integument of ovule. 



FIG. 15. CATKINS OF 

 HAZEL. 



(From Oliver, " Ele- 

 mentary Botany.") 



$ male ; $ female 

 flowers. 



definite kind, either male or female, the union of both 

 these germs being essential for the procreation of the new 

 generation. 



Among plants we find male and female germ-cells in all 

 flowering species the former, the pollen-grain, being de- 

 veloped in the anther of the stamen of the flower ; the latter, 

 the ovule, lying in the ovary, to which the pistil leads. 

 Most flowers possess both sexual organs, stamen as well as 

 pistil ; but many flowers are uni-sexual, having either 



