STUDIES IN THE EFFECT OF ROMTGEN HAYS, ETC- 285 



The steciied seetls in the condition stitad above, were stimtod severely li}- 

 one hour's exposiu-e (coiTcsi»nds to 48 H). 



V. Discussion. 



Here, tha writer intends to compare the results of other authors with his 

 own and then to sum up his results. 



E. Schwarz says thatthei« is acceleration of growth by weak iiradiation, 



but he converted tlie time of exposure intD dose, i. e., when -^ H is obtained by 

 continuous exposure of 30 minutes, 5 minutes exposui'e gave -^-H, so that, by 

 2— niinntes — -H was obtained. In the strict meaning, these do5cs are ques- 

 tionab!e. 63- 5 minutes' exix)3nro (70H), air-dned seeds were severely stimted, 



.nccording to his results, but this ciunot hi accepted from the author's results 

 of exjjeriment VIT, thxt is, iu the air-dried seeds, with a water content of 

 13.75% 40 H-, 50 H-, 60 H- and 80 H-plants bore fruit, though the amount of 

 the crop decreased jiroportionally to the doses. So the writer presumes that 

 lie gave much larger doses than he stat3S.^ He says nothing about the seeds 

 used, on both the race and tha weight ; for Vicia /aba has large iudividual 

 deviations, so that special care must be taken. He seems to have used Vicia 

 /aba without these precautions, and, moreover, he sowed 3 iu a pot respectively 

 and placed them near the window, so the plants grew excessively, according 

 to his text figm-e, and he measured the lengih as the difference in growth 

 ITToportional to the doses given. The -wTiter thinks that it is not good to 

 draw such conclusions from so small a niimlxir of experiments without i^aying 

 attention to the above considerations. If his results are compared with those 

 of the writer (Experiment HI), they become doubtful, i. e., in the seeds with 

 a water content of öO%, 20 H show a positive stimulation, and one which was 

 iiTadiiited by a dose of more than 20 H developed. 



KoERNiCKE sowed in'adiated seedlings. This is not a good treatment 

 for Vicia /aba, because transplanting is harmful to the Legiuninosas, so the 

 plants received two impediments, the rays and by external injury. Therefore, an 



1. Dr. FcjrsAxn agrees with the writer's opinion. 



