554 THE AMEBIC AN NATURALIST [Vol. XLIX 



Type 2. ALT X ALt 

 In the third generation of a cross of Creasback, a typ- 

 ical pole bean with White Marrow, a runner bean with 

 probably a weak character for circumnutation, all lots 

 were of axillary inflorescence. The habit of climbing 

 was developed in various degrees so that classifications 

 of types was difficult. 



Cross Type 6 or 7. ALT + aLT or aLt 

 Notes on an early cross of Creasback by Prolific Black 

 Wax indicate that the generation F x were pole beans, the 

 generation F 2 segregating into 33 pole and 8 bush. The 

 latter is probably a 3 : 1 proportion as expected. Whether 

 all plants described as bush were of the spreading type 

 does not appear from our records. 



Cross Type 8. ALT X alt or alT 

 In a cross of Creasback with Blue Pod, a typical bush 

 bean, there occurs one strain of homozygous pole plants, 

 and also in the F 4 generation heterozygous types. Pole 

 and runner forms and bush forms of various types occur 

 in the proportions of 9 : 7 in one lot and in another of 3 : 1, 

 as might be expected in an F 4 generation. In another 

 small lot occur plants with long outstretched branches, 

 in another two plants of c type of habit. Evidently 

 Blue Pod has the constitution alt. 



The date from a cross of Creasback with Blue Pod do 

 not signify much, as the types isolated happen to be con- 

 stant, one a pole type and bush types, of which several 

 are described as somewhat spreading. In one there 

 occurs a runner bean. 



Creasback and Warwick crosses in the F 4 generation 

 behave consistently with the cross type, as assumed. In 

 one lot, 1 2 have axial inflorescence and three terminal. 

 Lots with spreading plants occur and one plant was noted 

 which possessed a very long axis, along with a twining 

 habit, but also terminal inflorescence. According to the 



