抄録
In this experiment we obtained the results that the secondary growth of potato tuber is induced by the treatment of 25 and 20 times of normal concentration of culture solution for 24, 28, and 72 hours and 15 times for 72 hours respectively, while it is scarcely induced in the plots of 15 times for 24 and 28hours, and is not affected with 10 and 5 times.
