6 
than the other parts of the plant, and his eee show that 
members of the grass or grain family influenced 
than others with which he experimented. He eel that 
he gamma rays can penetrate as much as a foot in moist soil. 
As my own experiments show, they produce important effects at 
a dice: at least seven or eight times as great as this. 
ance, Petit and Ancelin reported that by placing the 
d 
at the end of the thirteenth day were ten times as long as in 
the latter. With wheat and corn the increased length was not 
so great, but was very marked, as was also the greater length 
of the stem 
The Nedonal Agricultural School at Grignon, France, experi- 
mented with six varieties of potatoes and obtained by the use 
of the crop, the potatoes at the same time containing more starch 
and being correspondingly more mealy and palatable. Barley 
At the Agricultural en . Berthonval, the experiments 
were made on plots of a hectare each. Upwards of a 15 per cent. 
increase in the yield of grain was obtained by the radium treat- 
hat of sugar beets. 
e Harper-Adams Agricultural College at Newport, 
Foulkes also obtained a 14 per cent. increase in the yield of table 
beets and more than 20 per cent. in turnips, plots of a hectare 
red. 
essrs. Vilmorin, Andrieux & Co. and others experimented 
with flowers, obtaining very ae results on chrysanthe- 
mums, roses and other cut flowers. 
All experimenters with plants in pots have reported such 
phenomenal increases in root development that the plants 
