of the plants was mainly determined by temperature, light, 

 and evaporation, it may be said that the peculiarities of the 

 plant graphs for each of the various stations are measure- 

 ments of the seasonal climatic complex for that station as 

 this is registered by the growth of two-and four-wek old soy- 

 bean seedlings. The (ggj'O:**^ graphs represent graphically the 

 "readings" of the standard plant when groTvn in the ?-'ay de- 

 scribed and exposed to this seasonal march of conditions. The 

 reading for each r)eriod m^ty be regarded as the "plant produc- 

 ing power" of the climatic complex if the growing period. It 

 has been previously brought out that the readinrs on the stand- 

 ard plants seems to bear some relation to the values of the 

 three climatic conditions dealt with, especially in the case 

 of the four- week plants. 



If we average the readings for the season at each of ^he 

 stations, we get a number which represents the average seasona l 

 value of the plant producing power of the climatic complex as 

 it is registered by each of the growth processes considered. 

 ThJ s has been done for the exposed stations for the two-week 

 and for the four-week periods with the results shovm in Plate 

 ZIII. The ordinates of the graphs of averages represent the 

 average daily relative growth rates for the season for the two 

 sets of plants and the average daily relative intensities of 

 the climatic conditions . The name of the station at which each 

 average growth value was registered is given immediately be- 

 low the ordinate on which the value i.s clotted. The total 

 plant producing power of any station for either the two-week 

 or four-week grov/th periods would be secured by multiplying 

 the averare value of this growth rate during the season by 



