Self Sterility and Cross Sterility in the Apple. 



77 



other block of Rome Beauty trees some distance away. The 

 cross fertilized Rome Beauty trees yielded 174% bushels; the 

 check Rome Beauty trees for which no arrangement for cross 

 fertilization was made, yielded 83% bushels or the cross fertil- 

 ized trees had nearly twice the yield of the other check block. 

 The demonstration was made complete by a repetition of the 

 experiment in a succeeding year. 



The Growth Vigor and Resulting Size of Apples from 

 Selfed or Crossed Varieties. 



Certain objections may be made to the introduction of cross 

 fertilization on the ground that where such cross fertilization 

 takes place a scrub is produced which is worse than either par- 

 ent. If such is the case it would be the height of folly to cross 

 pollinate even though there was an increased yield, for apples 

 are largely sold on the basis of their color, shape and size, and- 

 if these items are not properly developed the increased yield 

 would not make up for the reduced selling price. The data in- 

 table 5 present the material to analyze this problem. 



TABLE 5. 



Size and Number of Seed from Selfed and Crossed Fertilised 

 Apple Blossoms. 







Mean 



Mean 



Varieties Crossed 



No. of 



Diameter in 



Character of 





Individuals 



Centimeters 



Seed 



Female Pollen 









Baldwin x Baldwin 



5 



6.36 



2.8 g — 2.2 p. 



Baldwin x Duchess 



1 



7.00 



4.0 g — 3.0 p. 



Baldwin x Golden Russett 



48 



6.36 



3.8 g — 2.8 p. 



Ben Davis x Canada Red 



8 



6.65 



5.5 g — 1.4 p. 



Ben Davis x Crab 



12 



6.25 



4.4 g — 1.4 p. 



Ben Davis x Golden Russett 



5 



5.66 



6.2 g — 0.8 p. 



Ben Davis x Gravenstein 



3 



6.53 



1.7 g — 0.3 p. 



Ben Davis x Mcintosh Red 



74 



6.28 



6.2 g — 1.1 p. 



Ben Davis x Northern Spy 



14 



5.22 



5.9 g — 0.4 p. 



Ben Davis x Opalescent 



35 



6.38 



7.0 g — 0.8 p. 



Ben Davis x St. Lawrence 



6 



6.75 



6.1 g— 0.2 p. 



Ben Davis x Wealthy 



16 



4.94 



4.3 g — 2.3 p. 



Early Harvest x Duchess 



2 





8.0 g — 0.0 p. 



Golden Russett x Ben Davis 



5 



022 



7.4 g — 1.2 p. 



Golden Russett x Northern Spy 



3 



5.40 



7.7 g — 0.0 p. 



Hurlbert Sweet x Ben Davis 



3 



7.17 



4.3 g — 3.7 p. 



Hurlbert Sweet x Canada Red 



1 



6.70 



3.0 g — 3.0 p. 



Mcintosh Red x Opalescent 



2 



6.15 



6.5 g — 0.5 p. 



Wealthy x Wealthy 



1 







4.0 g — 0.0 p. 



