248 



Journal of Agricultural Research 



Vol. XVI, No. 9 



Typical specimens are shown in Plate 31, figures A shovsdng the whole 

 fruits and figure B the same with sections made at the lines of measure- 

 ments. From left to right the first of the paired fruits shows the develop- 

 ment of V. planifolia when close-fertilized, while the second shows the 

 results when vanillon pollen has been applied. The sections show that 

 many more ovules have been fertilized near the apex of the ovary by the 

 V. planifolia pollen, while the vanillon pollen has fertilized many more 

 near the base than near the apex. This difference in location of the 

 ovules fertilized accounts for the striking difference in form which results 

 from the application of V. planifolia or vanillon pollen to the V. plani- 

 folia stigma. 



Table III shows the typical close-pollinated vanillon fruit to be of 

 nearly equal average girth at i inch from either end. Of the 54 fruits 

 measured the two girths were equal in 12, the apical girth greater in 18, 

 and the basal girth greater in 24 fruits. The girth at i inch from stem 

 end averaged 0.5 per cent greater than at i inch from blossom end. 



Table III. — Comparison of the girth measurements of the fruit of -vanillon 9 Xvanillon^ 



V51.. 



V13.. 



V 13.. 



V13.. 



V34.. 



V13.. 



V13.. 



V51.. 



V52.. 



V52.. 



V52.. 



V13. 



V13. 



V34- 



V43- 



V43 



Vsi- 



V13. 



Vi3- 



V13. 



VI3. 

 VI3. 



Vi3- 

 V13. 

 V52. 

 V13. 

 V13. 

 V52. 



V H2. 



V52. 

 VS2. 



V34- 

 V34- 

 V43- 

 V34. 



