30 Nebraska Agricultural Exp. Station, Research Bui. 7. 
(Fig. 12A, B), A and C in large pots of rich soil and B and D in 
pots of poor soil. Plants A and B belong to a race of rather tall 
bush beans, Red Marrow, and plants C and D to a race of very- 
short bush beans. Triumph. Plants A and B were from seed of 
the same self-pollinated plant of a previously inbred strain as 
were also plants C and D. 
That retardation in rate of growth in pole beans is often due 
to unfavorable, and acceleration to favorable, weather or soil 
conditions is seen in the behavior of plants grown in the garden 
during the dry summer of 1912 and irrigated twice. Figure 14B 
contrasts the irregularity in growth of such a plant with the 
regularity in growth of a plant (Fig. 14A) kept under the com- 
paratively uniform conditions of the greenhouse. Both plants 
belonged to the same inbred strain of the rather short pole bean, 
Snowflake. 
The extreme irregularity of growth of the plant shown in 
Figure 14C was induced by alternately favorable and unfavorable 
conditions. This plant was one of a rather tall race of pole beans, 
July, and was grown in the greenhouse. It was started in a rather 
small pot of rich soil and its growth forced by favorable tempera- 
ture and abundant water. Water was then withheld until it 
wilted badly, and for some time it was given only sufficient 
water to keep it alive. When its growth had almost ceased, it 
was transferred to a large pot of rich soil and again kept well 
watered. Under these conditions its main axis elongated rapidly 
until checked by a second period of artificial drouth. 
INHERITANCE OF DETERMINATE AND INDETERMINATE 
HABITS OF GROWTH. 
The results of Mendel (1865), von Tschermak (1904 and 1912), 
and of the writer (1904) were reviewed earlier in this paper. 
Mendel described his results in terms of height, but from my own 
work I am convinced that the character pair with which he dealt 
was really determinate and indeterminate habits of growth. 
Von Tschermak also designated his plants merely as tall and 
short. While it is possible that the very irregular results secured 
by him are due to the fact that he dealt with a cross of very 
distinct species, Phaseolus vulgaris and P. multiflorus, it seems 
quite as probable that they are due to failure to disti guish 
sharply between habit of growth and other factors of height. 
The classification used in my earlier paper (1904) was based 
distinctly upon habit of growth, tho the classes were not there 
listed as determinate and indeterminate. The data then presented 
indicated clearly the perfect dominance of the indeterminate 
