The Effects of Radio-active Ores and Residues on Plant Life. 

 THE EXPERIMENTS IN 1915. 



COPYRIGHT 



Another section of the Trial Plots dressed with radio-active Ores. 



Although it was not possible to record any very definite deductions from 

 the 1914 experiments, the subject was of such educational importance that 

 I decided to undertake a further series of tests in 1915, and in planning these 

 trials the experience already gained was found of the greatest assistance. 



No fewer than nine different radio-active materials were used for the 

 tests under notice, as against three only in 1914. The subjects selected for 

 experiment were Tomatoes, Potatoes, Radishes, Lettuces, Onions, Carrots, 

 Vegetable Marrows and Spinach Beets, and these were chosen for the widely 

 varying character of the produce, viz. : fruit, roots, foliage and bulbs. It 

 will therefore be seen that the 1915 tests were more numerous and far more 

 comprehensive than those of the preceding year. 



The following radio-active and other materials were used in 1915 : 



Pure Radium Bromide fl/ a strgngth of 



Pitchblende Concentrates ... ... ... 50-60 milligrammes per ton 



Ore A 8 



OreB 9 



Slime, or Mine Residue 1-8 ,, ,, 



McArthur's Sand ... ... ... ... 1-5 ,, ,, 



Vanadium Sand -5 ,, ,, 



Nirama ... ... ... ... ... ... strength unknown 



Lignaite ... ... ... ... ... ... ,, ,, 



Farmyard Manure 

 Complete Artificial Fertiliser 

 Coal Dust 

 Chemical Mixture 



