A Genetic Study of Plant Height in Phaseolus Vulgaris. 29 
Bush beans are, of course, influenced by unfavorable weather 
and soil conditions as well as pole beans but no retardation in 
rate of growth of the upper internodes comparable to that in 
pole beans is to be seen. The acceleration in rate of growth is 
lessened but the termination of growth is no more abrupt under 
unfavorable than under favorable conditions. Figure 13 shows 
characteristic growth curves of bush beans when grown in rich 
and in poor soil under favorable atmospheric conditions. These 
plants (Fig. 13 A, B, C, D) were grown at the same time and 
under the same conditions as two of the plants just discussed 
Internode numbers. 
Fig. 14.— Growth curves of pole beans. (A) Snowflake 2,424 (f) grown under 
fairly favorable and comparatively uniform conditions in the greenhouse. 
(B) Snowflake 3,427 (f) grown in the garden in a dry summer and irrigated 
twice. (C) July 3,956 (7) grown in the greenhouse under alternately 
favorable and unfavorable conditions. 
