5 
more susceptible than other parts of the plant. Some plants 
we 
a 
was reported. It was found that parts of plants exposed to 
radium emanations would themselves become radio-active. The 
degrees of such Reapeapins were, the root most, then, in order, 
stems, buds, leaves and flowers. It was decided that this ac- 
tivity did not exist in the tissues tl ut in their contained 
water 
lad 5 as re 1 4 4 j o 
Gager I E 
He used tubes of glass and other substances which were coated 
on the inside with substances eee radium. He also used 
rods similarly coated on the outside. Such tubes or rods would 
be laid upon dry seeds for various periods of time and the seeds 
were then planted and their germination and growth compared 
ith those of others not so treated. Seeds were soal i r 
containing the emanations and were then planted and similarly 
compare lan e grown in water containing the emana- 
plante 
activities to which the seeds and plants were Sen in these 
experiments varied from 7,000 X up to 1,500,000 X, all of which 
owever, we now know were excessive. He always found the 
damage greater with the increase of activity. Similarly, he 
found that the seeds farthest away from the buried tube showed 
would markedly stimulate germination an wth. He finally 
reached a conclusion expressed as follows: “The rays of radi 
act as a stimulus to protoplasm. Retardation - growth following 
exposure to the rays is ssion of over-stimulation; accelera- 
tion of growth indicates stimulation between a minimum and an 
optimum point.” He agreed that the root was more affected 
