246 



Journal of Agricultural Research voi. xvi. no. 9 



The other type of Vanilla spp. on which data are here presented is 

 termed "vanillon.*' Under this name are grouped a number of varieties 

 or species other than V. planijolia which, though presenting distinct 

 differences, agree among themselves in having large yellow blossoms in 

 contrast to the much smaller, paler, greenish blossoms of the V. plani- 

 jolia. The fruits are much thicker and shorter than those of the 

 latter and differ from it in being of a more uniform thickness near 

 the two ends, the blossom end frequently being rather tapering. 



Where to either the V. planijolia or the vanillon stigma pollen of the 

 other has been applied a very decided modification in the form of the 

 fruit has resulted. This modification is in most instances so decided 

 that these fruits can be distinguished from the close-fertilized fruits at a 

 glance. 



These conclusions were reached as result of observation and data on 

 crosses made in 1916. Data taken on crosses in 1917 confirmed the 

 work of the preceding season. The accompanying illustrations and 

 tables present the work of the two seasons. 



Tabi.Iv I. — Comparison of the girth measurements of the fruit of Vanilla planifolia $ X 



V . planifolia J 



Length of fruits. 



Inches. 



6K 



6K 



7 



7 



7 



1% 



1% 



7K 



7K 



7K 



7K 



8 



8 



8K.. 



8K 



8K 



8K 



8K 



9 



9 



9% 



9% 



9H 



Total . . 

 Average 



Girth in 



sixteenths 



of an inch 



at I Clinches 



from stem 



end. 



18 



23 



24 

 20 

 21 

 23 

 23 

 24 

 24 

 22 

 22 



Increase or 

 decrease in 

 circumfer- 

 ence of pods. 



21.8 



< 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 

 < 



< 

 < 



Girth in 

 sixteenths 

 of an inch 

 at I inch 



from 



blossom 



end. 



26 

 22 

 24 



22 



24 

 28 



25 

 24 

 25 

 25 

 28 

 26 

 24 

 28 

 28 

 30 

 2,2, 

 30 

 26 

 28 



30 

 28 

 29 



613 

 26. 7 



