December, 1921. 



SCIENTIFIC AGRICULTURE 



123 



tions, a unit'oniily vigorous row of pro- 

 ductive trees. On the north of the poorest 

 yielding- jirogeny is the row ])r()pagate(l 

 from the largest and most regular hearing 

 tree, and tliis row^ shows only 17. (i4 pei- 

 eent. of deaths and is also uniformly vigor- 

 ous in appearance, although not approach- 

 ing in this respect tlie heaviest ;\ieldihg 

 progeny. These differences are very mark- 

 ed and readily noticeable to the casual ob- 

 server. There appears to be, therefore, in 

 this instance a close relation between vigor 

 and productiveness, which seems to liave 

 been isolated by clonal selection. As a 

 more or less efficient check on the fore- 

 going experiment, scions from the three 

 parent trees mentioned were top-grafted 

 on large, bearing trees in the Russian or- 

 chard. Five trees were used for this pur- 

 pose and on each tree scions from all 

 three parents were grafted, the position of 



17 972. 



Average total yield per tree for 9 years 

 972 



= = 57.18 gals. 



17 

 Range from 30.25 gallons to 77.25 galls. 



Yichl of Progeny from Heaviest and most 

 regular Hearing Tree in Wealthy 

 Orchard, No. 4-5. 

 Yield given in gallons. 



H 



5-1 

 5-2 

 5-3 

 5-4 

 5-5 



6 



7 



8 



9 

 5-10 

 5-11 

 5-12 



S 

 'S 



So • 



c x: 

 g-g 



rK '^ 

 O 0) 



39.5 



41.25 



23.25 



23.50 



52.75 



66.50 



31.25 



45.50 



54. 



62.25 



75. 



65.75 



c ^ 



So 



13 



14% 



11 



14% 



151/2 



17 



131/9 



16 



I61/4 

 16 

 16 

 131/, 



12 580.5 



Average total vield per tree foi- 9 years 

 580.5 



= = 48.375 gals. 



12 

 Range from 23.25 gallons to 75.25 gallons 



Yield of Progeny from Poorest Yielding 



tree in wealthy Orchard No. 4-2. 



Yield given in gallons. 



o 2 



-M O ^ ■ I- X 



O "w ?2 <V 



0) Sj c t. 



4-1 



4-2 



4-3 



4-5 



4-6 



4-8 



4-10 



4-11 



O t 



31.5 



49. 



42. 



42. 



24. 



25. 



41. 



27.5 



131/, 



14 



14 



15 



12 



13 



14% 



131/4 



8 282. 



Average total vield per tree for 9 vears 

 282 



= = 35.22 gallons. 



8 

 Range from 24 gallons to 49 gallons. 



