LITHIUM. 259 



Ka 39. POTASSIUM. 



Ka Oa N : Ka Cl = 101 : 74.5 = 1.35 570. Chg. 47 low. 



Penny, 1839, Ser. I, 7 Det., 640 630; 10. Mean 66 high. 



II, 7 Det., 641 628; 13. 63 high. 



Stas, 1865, 7 Det., 655 638; 17. " 75 high. 



Hibbs, 1896, 5 Det., 642 620522. " 57 high. 



These give in this order, 014, 0.13, 0.18 and 0.12 high. 

 Stas gives 39.18, Hibbs 39.12. 



The method is one used in the vicious circle of Stas, and 

 is unfit for anything. 



But we have no real direct determinations for potassium, 

 confined to oxygen compounds. 



La. LANTHANUM. 



La2 Os : Laa (O4 8)3 =326 : 566 = 0.57 598. Chg. 14 high. 



These values result from the common La 139. The 

 following is the analytical record : 



Hermann, 1861, 3 Det., 690 610; 80. Mean 57 high. 

 Zschiesche, 1868, 6 Det., 277 745; 532; " 576 low. 

 Cleve, 1874, 5Det., 667 590; 77. " 22 high. 



" 1883, 12 Det., 500 458; 42. " 117 low. 



Brauner, 1882, 2 Det., 566 549; 17. " 39 low. 



" 1882, 5 Det., 525 451; 74. " 1 17 low. 



Bauer, 1884, 406^,569 482; 87. " 73 low. 



These are apparently the best determinations for this 

 element; they show plainly, that the final work has not yet 

 been commenced. 



Li = 7. LITHIUM. 



CO2 : LiaOa = 44 : 74 = 0.59 460. Change 162 low. 

 Diehl, 1862, 4 Det., 440 401; 39. Mean 43 low. 



Troost, 1862, 2 Det., 485 427; 58. " 4 low. 



The value of Troost would be only 0.002 high, or 7.002 ; 

 but the range is too great. 



The other determinations belong mainly to the Stas mud- 

 dle. We give briefly, first our atomic ratio ; also R = range. 

 0.29 617, Li Cl : Ag Cl, Mallet, 2 Det., R 56. Mean 27 low. 

 Troost, 2 Det., R 45. " 24 low. 



0.39 352, Li Cl : Ag, Stas, 3 Det., R 5. "6 high, 

 i .62 353, Li Oa N : Li Cl, Stas, 3 Det., R 12. " 242 high. 



