BY THE SELECTION OF SOMATIC VARIATIONS. 39 



Plants grown from pattern green-yellow-red blotched (fig. 2) derived 

 from green-yellow spotted-red blotched (fig. 4) gave again the same pat- 

 terns that were directly derived from that pattern. 



A general review of the entire series of variations shows that in 

 respect to the relative positions and total amounts of green and yellow, 

 and the total amount of red in the epidermis, the extremes of develop- 

 ment possible are realized, with, also, the appearance of a series of inter- 

 mediate types. Judging the variations in any one pattern by the 

 range of bud variations that have thus far developed, it appears that 

 any pattern tested in considerable numbers gives by bud variation the 

 entire range of changes possible. 



FREQUENCY OF THE BUD VARIATIONS. 



With the list of the types of variations given in table 1 there is also 

 given the data as to the number of times each occurred and the total 

 number of plants involved (not including plants of patterns which did 

 not produce the particular variation) . The various tables present the 

 details of their data, which may be now summarized under the main 

 types of changes outlined in table 1. 



A. CHANGES INVOLVING YELLOW AND GREEN. 

 I. INCREASE OF YELLOW AND DECREASE OF GREEN. 



1 . The almost complete loss of green with increase of yellow occurred 

 as a bud variation 12 times in a total of 630 plants (not including plants 

 of patterns which did not give this variation). It was derived most 

 frequently from patterns green-yellow-red blotched (fig. 2), yellow-green- 

 red blotched (fig. 6), and green-yellow-solid red (fig. 8). It developed once 

 from pattern green-yellow spotted-red blotched (fig. 4). The pattern 

 was not realized uniformly on any plant as a fluctuating variation. On 

 a few plants of the pattern green-yellow-red blotched which developed 

 mixed patterns with a marked increase of yellow during the summer, 

 some leaves approached this pattern. One of the most marked of 

 these is shown in figure 20. 



2. It will be remembered that the green-yellow-red blotched pattern 

 was borne by the parent plants and that all other patterns were derived 

 directly or indirectly from this. The return to this pattern occurred 

 as a bud variation from type green-yellow spotted-red blotched in 4 

 instances on a total of 266 plants and also as fluctuating variations, 

 especially in clone 14, as shown in table 3. 



3. The sudden appearance of scattered areas of yellow in single 

 branches of plants otherwise having no yellow occurred but twice. 

 The same type green-yellow spotted-red blotched, however, appeared 

 quite gradually for entire plants in 38 cases out of the 90 plants which 

 were grown for the pattern green-red blotched. 



