80 B. B. BoHwood — Ultimate Disintegration Products 



No. Mineral Locality 



22. Uraninite, 

 Annerod, Nor., 



23. Annerddite, 

 Annerod, Nor., 



24. Uraninite, 

 Elvestad, Nor., 



25. Uraninite, 

 Elvestad, Nor., 



26. Uraninite, 

 Skaartorp, Nor., 



27. Uraninite, 

 Huggenaskilen, Nor., 



28. Uraninite, 

 Huggenaskilen, Nor., 



29. Thorite, 

 Hittero, Nor., 



30. Uraninite, 

 Arendal, Nor., 



31. Uraninite, 

 Arendal, Nor., 



32. Uraninite, 

 Arendal, Nor., 



33. Thorite, 

 Arendal, Nor., 



34. Orangite, 

 Landbo, Nor., 



35. Xenotiine, 

 Naresto, Nor., 



36. Hielmite, 

 Falun, Sweden, 



37. Poly erase, 

 Slattakra, Sweden, 



38. Thorianite, 

 Sabaragamuwa 

 Province, Ce} T lon, 



39. Thorianite, 

 Sab. Prov., Cey., 



40. Thorianite, 

 Sab. Prov., Cey., 



41. Thorianite, 

 Sab. Prov., Cey., 



42. Thorianite, 



Cey., 



43. Thorianite, 



Galle District, Cey., 



Per Per 



cent cent 



U Pb 



68 7-8 



15 2-2 



66 9-3 



57 8-0 



65 8-8 



68 8-8 



76 9-0 



8-2 1-2 



56 9-8 



61 10-2 



56 9-4 



9-0 1-5 



7-5 1-2 



2-9 0-62 



1-9 0-20 



7-4 0-85 



9-8 2-1 



10-8 2-7 



12-8 2-4 



11-2 2-7 



11-1 2-3 



25 2-1 



Ratio 

 Pb 



U 



Analysis by 



0*12 Blomstrand, Jour, prakt. 

 Chem.,xxix,191,1884. 



0'*14 Blomstrand, Dana's Sys- 

 tem of Min., p. 741. 



0*14 Hillebrand, this Jour- 

 nal, xl, 384, 1890. 



0-14 Hillebrand, I. c. 



0-13 Hillebrand, I. c. 

 0-13 Hillebrand, I. c. 



0-12 Lorenzen, Nyt. Mag.,. 



xxviii, 249,' 1884. 

 0-14 Lindstrom, G. For. 



Forh., v, 500, 1881. 

 - 17 Hillebrand, I. c. 



0-17 Hillebrand, /. c. 



0-17 Lindstrom, Zeit. f. 



Kryst., iii, 201, 1878. 

 0-17 Nord'enskiold, G. For. 



Forh., iii, 228, 1876. 

 - 16 Hidden, this Journal, 



xli; 440, 1891. 

 0-21 Blomstrand, G. For. 



Forh., ix, 185, 1887. 

 0-10 Weibull, ibid, ix, 371, 



1887. 

 0"*12 Blomstrand, Dana's 



Min., p. 745. 



0*21 Dunstan and Blake, 



Proc. Roy. Soc. Lond., 

 Ixxvi (A), 253, 1905. 



- 25 Dunstan and Blake, I. c. 



0-19 Dunstan and Blake, I. c. 

 0*24 Analysis by writer. 



0-21 Biichner, Nature, lxxv, 

 169, 1906. 



- 086 Dunstan and Jones, 



Proc. Roy. Soc, Lond., 

 lxxvii (A), 546, 1906. 



