216 



HIDEO KOIIURO. 



Table YIII. 



Table IX. 



Table IX sLws the relatiou Ijehveeu the percentage of sprouted seeds 

 to tlifit of the remaiuder in flowering time (refer to Table Ylil) and proves 

 that the plants of 20 H upwards were injuriously aSectsd. As above stated, 

 the seeds having a water content of a little over 6ii% were stunted even hy 

 10 H. As Tables VII and VIII show, it seems that there is no acceleration 

 of sprouting and bloom, rather a ret.Tjrdation. 



Tlie common results of Experiments V and VI were as follows : — 



1. According to the observation of unsprouted seedlings on Nov. 30, there 

 was no difference in growth proportional to the doses given ; the seeds had 

 developed to almost the same stage, and th3 roots reached a length oi 

 ±2.5 cm.; but they were injured at their tip and became stumpy, though 

 their cotyledon was healthy (at this time, the controls and the weakly 

 iiTadiated reached their first step of development as little plants). 



2. Tho time of sprouting and bloom was not accelerated and both were 

 rather delayed. 



No observation was made for tho crops of Experiments V and VI, as 

 there was damage l)y P. abrainns in addition t3 ths effect of Röntgen rays. 



Experiment Yll. 

 This experiment was imdertaken tj sea if !U"j-dried seeds arc affected by 



