Sept. 1. 1920 Line-Selection Work with Potatoes 567 



LINB 

 NO. 



REMARKS. 



552. A good dark green type. 

 551. A good dark green type. 



608. A good dark green type. 



609. A good dark green type. 



604. A good dark green type. 

 580. A good dark green type . 



525. Third unit lacking in color; others good. 



584. A good dark green type. 

 589. First unit not a good type. 

 618. A good dark green type. 

 596. A good dark green type. 

 612. First unit lacking in color. 



605. A good dark green type. 



614. Third, fourth, and fifth units not good type. 



593 . Color not good although the line is quite vigorous. 



603. A good dark green type. 



568. Lacking in color but fairly vigorous. 



595. A good dark green type. 



549. A good dark green type. 



531. Last unit showing a tendency to bum. 



577. A good dark green type. 



607. A good dark green type. 



548. A good dark green type. 



585. Last unit light-colored and burning; others very good. 



Of these 26 lines which have appeared at least twice among the highest- 

 ranking 20 or would be ranked among the highest 20 on their 3-year 

 average production by weight, 17 have good records as to vine charac- 

 teristics and 9 contain some vines of a degenerate type. It will be 

 remembered that loss of vitality is indicated in this variety by a loss of 

 color and a tendency for the leaves to bum about the edges in typical 

 degenerates. 



In Table XXI will be found data upon the 3-year average numerical 

 tuber production of Early Six Weeks. The maximum variation found is 

 1.78 tubers per hill. The annual average tuber production shows even 

 greater variation. These 100 tuber lines averaged 2.12 tubers per hill in 

 1916, 4.04 in 1917, and 2.63 in 1918. The 20 highest and 20 lowest 

 yielding lines when ranked upon tuber production in numbers have been 

 grouped in Tables XXII and XXIII. The first 8 lines starred in Table 

 XXIII are typical degenerates with bad yield records by weight. There 

 are, however, 5 lines in Table XXIII which also appear in Table XXIV 

 among the 40 with good vine characteristics in 191 8. Going back to 

 Table XVIII, it will be noticed that these 5 lines have very good records 

 when judged on tuber production by weight. It is true that none of them 

 are high yielders, but they fall very close to the average of the 100 lines. 

 Fourteen of the lines in Table XXII appear in Table XXIV, or among 

 those selected in 191 8 as having good vine characteristics. 



