21 
One of the most interesting observations referred to the 
activity of cut-worms upon cabbage plants. Both early and 
control plot and almost as many in DD. When replaced by 
new ones, many of the latter were again cut down. The CC plot 
also lost quite a number, but the AA and BB plots only one 
plant each. It did not appear to me possible that this difference 
was due to the presence of radium and IJ should scarcely have 
noted it but for the fact that a gentleman who had applied R A F 
e 
relative affects on the upper and lower portions of a 
sloping plot have not been uniform. Of ten rows of celery so 
planted, plants in the lower rows are nearly twice as large as 
those in the upper ones, and the transition is gradual and nearly 
the aerial tissues is relatively slight. Those from the lower rows 
would strike the roots of the plants in the upper rows. The 
explanations are mutually contradictory, but so are the effects 
In conclusion, it may be stated that the yield of most crops 
as been increased by the addition of some amount of RAF, 
the amount differing with different crops. The beneficial effects 
continue over successive crops, perhaps for many years. The 
largest amount required by any crop would cost less than the 
increased market value of such crop of the first year 
