-S8- 



GRAPHS OF TIIE GRO-,?TH- rEMPERATTJEE RELATIONS. 



It has iDeen stated above that all three series of 

 grand averagesCfor the whole period, for the last 24 hovirs, 

 and for the first part of the period) agree in showing the 

 highest growth rates for the maintained temperatures, 28 

 and 31 , and that the average rates for these two tempera- 

 tures are nearly alike in all three cases. Referring to 



tables TV, yj and VII for to the graphs of fij. 1), it is 



9 

 seen that the rate for 31 is 2.5 per cent lower than that 



for 28 , for the last 24 hours of the culture period. ?or 



the entire period the rate for 28 is 1.5 per cent lower 



than that for 31 and for the first part of the culture per- 



f^ 



iod the rate for 28 is 4.7 per cent lower than th^^t for 31 . 



It is probably safe to regard these dif''erences as insignifi- 

 cant, considering the general nature of the entire study, and 

 to state thst the data here considered indicate that the op- 

 timum temperature for the germination of these se"ds and the 



n 

 early growth of the seeJling shoots lies between 28 and 3l' . 



/ growth-temperature graph was prepared for each of 



the three sets of grand averages and a study of these graphs 



will bring out some additional information. The three graphs 



are shown in figure 1. The actual values are shov;n by the 



circles and the lines represent smoothed graphs drawn to fit 



the distribution of the circles in each case, ""hey may be 



taken as indicating a close approximation to the inclications 



