EXPERIMENT STATION REPORT. 337 



formula is: 91/97 B-3-1,* B-3-6, B-3-7, B-3-8 and B-3-24, 

 looking from left to right. The first, "Jackson Wonder," and 

 the fifth, "Willow-leaf," are the parent types; the second is a 

 dark red like its own immediate parent, the third is similar to 

 the second in being solid color but a light red, while the fourth 

 is mottled dark upon a brick red background. 



The "Jackson Wonder" itself is a variable sort, the seeds 

 sometimes being quite daHc and, at other times, the basal color 

 is dark and the darker blotches are therefore indistinct. The 

 brick red of number four, while blotched like the "Jackson Won- 

 der," is so different in the color of its background as to permit 

 its being separated from the parent type. The shade of red here 

 varied greatly so that the sample shown is one that stands for 

 many small varieties. 



In the lower row is shown the seeds of five plants in the second 

 generation of a cross of "Jackson Wonder" upon "Station," and 

 in this cross the immediate mother of them all produced uni- 

 formly light red seeds. The formula for this is : 91/217 B-42-4, 

 B-42-10, B-42-14, B-42-17 and B-42-19; that is, the sixth 

 in the Plate is from plant No. 4, which is from plant No. 42, 

 which is from the blend. The color types are very close to those 

 shown in the upper row. The darker reds, 3-6 and 42-10, are 

 quite similar, as also the other solid color set, 3-7 and 42-14, 

 but in 42-17 the background is lighter than in 3-8 and suggests, 

 therefore, a still closer aflfinity with the "Jackson Wonder." 



If a set for the Plate had been selected from all the crop 



* To simplify record-making, the following scheme is used : The first gen- 

 eration is called the Blend, in which the characters of the two parents are 

 often quite evenly united, and from the blend seeds the first generation after 

 the blend is produced. The letter B stands for the Blend, and, following it 

 with a dash between, is the number of the plant involved in the line of 

 descent. The second generation, in the same manner, is indicated by the 

 plant number concerned in the strain, and so on so long as the work con- 

 tinues, generation after generation. The following formula, B-3-21-14-7, 

 shows that the work is expressed for four generations from the blend, and 

 that the description, etc., that follows it concerns the 7th plant — in a list of 

 any number, whose immediate ancestor is the 14th plant of the set making 

 up the third generation, which in turn is descended from the 21st plant of 

 the second, and the 3d in the first generation after the blend. 



22 Ex 



