558 THE AMERICAN NATURALIST [Vol. XLIX 



pened to be of the spreading type, thus giving homo- 

 zygous erect offspring. 



In the cross of Golden Eyed Wax with Prolific Black, 

 outstretched branches due only to axial inflorescence 

 were noted. 



Spreading plants of this nature also occur in the cross 

 of Bountiful and Prolific Black Wax. In the latter two 

 crosses the twining habit was more or less developed in 

 the longer branches. 



Cross Type 34, 35, or 36. alT X alT, alT X alT, or 

 alt X alt 



In the crosses of this type only erect bush beans with- 

 out runners or spreading branches, should occur, al- 

 though contorted stems might possibly appear. Such is 

 the behavior of the following crosses of this type: 



Low Champion X Blue Pod Butter 



Blue Pod Butter X Golden Eyed Wax and reciprocal 



Blue Pod Butter X Mohawk and reciprocal 



Challenge Black Wax X Warwick 



Currie X Mohawk and reciprocal 



Currie X Red Valentine 



Blue Pod Butter X Warren 



Bountiful X German Black Wax 



In the crosses, Challenge Black Wax by Davis Wax and 

 Blue Pod Butter by Davis Wax, lots have been isolated 

 with short shoots above the plants somewhat resembling 

 the habit of Burpee Stringless and Giant Stringless. 

 This behavior is unexpected if such a plant type is to be 

 described by the formula AIT. The Davis Wax type 

 used in the crosses may, however, have been of a different 

 strain from that described in the table. This variety is 

 the only one used in the crosses that was not under the 

 observation of the writer, as its growth was discontinued 

 the year in which these notes were taken. 



While the factors discussed above primarily determine 

 the plant habit, there are several others of secondary con- 

 sideration. No special notes were taken with regard to 



