STUDIES IN TUE EFFIX'U OL' KUNTUEN R.VYS, ETC. 



2.57 



of shoot as b) tlio clilli'veuce of iufluonce caiisad bj' tlic iniuliiition. (TLo 

 irmdiated seeds were sown in n soil, 3 gmiii3 to a pot, all pLxced near tho 

 v,uu\in\.) 



As tlio table shows, tho pLmts grown fi-om tho Sü^ds irrathatcd for 2.5 minutes 

 were best in growth — 2.5 miuntes' exposure is eqiml to ^^ H, because scai'cely 

 —II was given by continuous irradiation of 30 luinut&s — so he considered 

 that ^, H was the minimum dose for the growth to Ije aftected positively. 

 Next ho avoided chance weak irradiation of ^•igorous seedhugs, they develop 

 better as a natural consequence. He wished to make researches on the effect 

 of X-rays upon germinated seeds, so he chose the seedhngs of Vicia fuhci 

 which kid previously been germinated in a thermostat, and in'adiated 

 them to such a degi-ee that the most vigorous one was the weakest and the 

 weakest or the one without sprout was the strongest. Then they were planted 

 out at the Same dei^th. 



After ß days tho sprouts of seedhngs Nos. Ill and r\^ a^^peared alxjve the sur- 

 face of the soil, the kttor of the two was better in growth and one of the shoots 

 reiiched 1 cm. The length of shoot is tabulated above. So he said : " es ^\■erden 

 demnach die Bohnen, che sich gegeuüljer den anderen dm-ch eine gewisse 

 Keimträgheit kennzeichnen, durcli die Bestralilimg derart augeregt, daß sie 



