Phil. Mag. Ser. 6, Vol. 42 PL XVII, 



Fig. 4. —Thorium C. 



I.O 





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A 









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4,0 4.5 5.0 5.5 6.0 6.5 7.0 75 SO cms. 



Fig. 6.— Thorium C, 



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4.0 4.1 4.2 4*3 44 45 *6 4.7 4.8 cms. 



