STl'DIES IN TUE EFFECT OF R')NTOEN Il.US, EL'C. 



267 



oxtra seeds werc so\vu ou both siilo3, in the same iuterva,ls. Besides, two sots 

 of 7 sun pots v>ore pivp ired for tlie rest and seeds s^^\^^ in respectively. Wlion 

 tliis wiis done, 17 hours luul elai^sed fi"om the end of the iiTiwliition. 



One can keep environmental conditions fairly const.\nt when sowing the 

 seeds in a limit*'«! pLuv, jiud thus tlu> frame was constructed instead of the 

 pots. 



McUuiro given wiis the same as iu Esp..rhueut I. The experiment exleudotl 

 fi'om March 10 to May 22, and dming this period rainy days were rare, st) 

 tlio fr.imo and pot were watered every day. 



The i-esults of this experiment are tabulated below. 



T.VBLE II. 



In the table, the ^\Titer itsed " vis." (visible) to indicate the length of 

 shoot. It means a very small sprout which scarcely came above the snrface 

 of the soil. In this experiment, the iiTadiated material sprouted on the soil, 

 while none sprouted in Exj^ieriment I, so the ^vl•iter tabulates the length of 

 shoot to indicate the degi'ee of sprouting, he ^\^shed by no meaus to compare 

 by this length the difference of growth proportional to the doses given. One 

 of the 40H-plants developed as well as the uniiTadiated control plants and 

 showed a length of shoot of 36.5 cm. at the end of the experiment. 



As is clearly shown iu Fig. 2, the plants ceased to gi-ow at almost the 

 same state as in ExjDcriment I, this may ba explaiucLl l)y Üu above st.xted 



