584 THE AMERICAN NATURALIST [Vol. 



In the case of known F 2 plants, as given in Table ! 

 the results are 



Here again there is a very remarkable agreement. In 

 fact all of the data at hand fit into this theory very nicely. 

 Final proof of its correctness or incorrectness can only 

 come with more extended crossings between the segregates 

 and with the parent stocks. Such experiments are now 

 under way. 



Relation of Eye Patterns to Type of Vine 

 Two years ago while going over some data from pure 

 lines of Yellow Eye beans grown inside a screened en- 

 closure the writer was struck by the fact that with few 

 exceptions all of the 0. F. Y. E. pure lines had the bush 

 type of vine, while nearly all the I. Y. E. lines were classed 

 as short runners. This point was further emphasized 

 by the observation that in several cases the segregation 

 from piebald beans showed that all of the 0. F. Y. E. 

 segregates were bush beans and all the I. Y. E. were run- 

 ners. It was, therefore, of some interest to tabulate the 

 data relative to type of vine in connection with the eye 

 pattern. 



e The classification of plants with reference to type of 

 vine has usually been made at the time of harvest. In 

 some years the plants grown inside the screened cage 

 have been classified as to vine type shortly before harvest. 

 In either case the plants were mature or practically so. 

 The plants grouped under the term "bush" are those 

 which show determinate growth, terminal inflorescence, 

 and lack the ability to twine about supports. The "run- 

 ner" plants show axillary inflorescence and the twining 

 habit (circumnutation). All of the runner beans consid- 

 ered m this paper are of the short runner or short pole 

 type, rarely reaching a total height of more than 125 cen- 



