476 



Reference to the figs., some of which are taken from A. 

 Bonnet's " Selection as applied to the Vine " illustrate the different 

 possible occurrences. 



Figs. 4, 5, and 6 illustrate, on a magnified scale, the structure 

 of a normal grape vine flower and show the bud, then the peculiar 



4 5 6 



FIG. 4, A grape vine floral bud. 



FIG. 5. Same showing the petals of the corolla detached from the base and 

 united above, pressing the anthers against the pistil. 



FIG, 6. Same with the corolla removed, and showing the anthers ready for 

 excision. (FOEX.) 



way the petals unfold from the base of the calyx. This dislodge- 

 ment of the cap causes a jerk which scatters the pollen in the 

 anther sacs on the stamens (Fig. 6). This pollen comes into 

 contact with the stigma of the pistil which carries it to the ovary. 



Free setting varieties have the stamens erect, forming a cluster 

 round the inflated tip or stigma, a position which is found 

 advantageous to the proper fertilisation of the ovary. These vines, 

 which constitute the majority, are perfect hermaphrodites. 



FIG. 7. Annular incision at A. 



FiG.7A. Vine shoot 

 pinched back. 



