Table 8 

 (based on the data of Breslavets and Afanas'eva, 1932 and 1933*) 



FIGURE 8. Differences in the development of peas depending on 

 application of various X-ray dosages. 



considered the most beneficial dose since with it 

 the plants showed the most vigorous development 

 and gave the greatest number of pods (Fig. 8). 

 In this experiment the yield could be judged only 

 by the number of pods, which were counted on 

 the controls as well as on all the irradiated plants. 

 The average number of pods per plant with its 

 probable error is shown in Table 9. 



From this table it can be seen that a very 



weak dose (250 r) makes the difference between 

 the controls and the irradiated plants reliable 

 [i. e. , greater than the probable error], where- 

 as a dose of 350 r significantly increases the 

 number of pods. Beginning with 450 r the curve 

 begins to drop and with 1000 r the number of 

 pods evens out with the number of pods in the 

 control plants. These facts indicate the stimu- 

 lating effect of X rays, which shows up in an 

 increase of the number of pods per plant. For 



22 



