BUD VARIATION IN THE WASHINGTON NAVEL OEANGE. 127 



recorded on which data had also been secured for six years, and 

 column 4 shows the rank secured by the same trees on the basis of 

 their 6-year performance records as shown in Table II. The facts 

 that the same trees appear in the first three ranks in both summaries 

 and that the other trees represented are so nearly identical in their 

 rank for the two periods show that for all practical purposes per- 

 formance records of full-bearing, trees for four years are as satisfac- 

 tory as those for six years. 



This is additional evidence in support of the general proposition 

 that the variation in the amount of the annual crops produced by a 

 given series of individual Washington Navel orange trees is relatively 

 uniform throughout the series each year; that is, the highest produc- 

 ing trees in any one year are in general the highest producing ones 

 each year, and the lowest producing ones remain at the bottom of the 

 list continually. Table VI also offers additional support of the general 

 proposition that individual trees are relatively very stable over a series 

 of years in the character and the amount of their fruit production. 



Table VI also shows the relative ranks of the lowest producing 

 trees recorded for both the 4-year and 6-year periods. The indi- 

 vidual trees listed here are even more nearly identical in their rank 

 for the two periods than were those in the highest producing ranks, 

 giving additional evidence in support of the truths just stated. 



Table VII shows the annual performance record of a tree of the Pro- 

 ductive Washington strain for the season of 1914 and also the 6-year 

 period performance record of the same tree. This table is presented 

 for the purpose of comparison with Table VIII, showing the annual 

 and period performance records of a tree of the Unproductive strain, 

 and with Table IX, showing the annual and period performance 

 records of a tree of the Wrinkled Australian strain. These tables 

 illustrate the form in which the data have been recorded during all 

 the investigational work on which this publication is based, except 

 that in order to economize space the form for recording the detailed 

 data for 1914 has been rearranged. 



These records show the comparative behavior of typical examples of 

 three Washington Navel orange strains which are of great importance 

 in the study of the origin of varieties by bud selection. The marked 

 variations in the quantity and commercial quality of the fruit borne 

 by these trees illustrate the relative value of these strains and are 

 typical of the differences in production that exist in other strains of 

 this variety. 



