CHROMIUM. 



2 4 I 



Co = 59? COBALT. 



Co : Co O = 59 : 75 =0.78 667. Change 28 high. 



1 Russell, 1863, 14 Det, 614 550; 64. Mean 75 low. 



2 Zimmermann, 1886, 10 Det., 638 630; 8. " 32 low. 



3 Kriiss, 



4 Remmler, 1891, 24 Det, 859 508 5351 . " 54 low. 

 2 Co : Co2 Cl, ION H3=u8 : 501=0.23 553. Chg. 30 high. 



5 Sommaruga, 1866, 7Det.,858 806; 52. Mean 274 high. 



6 Lee&W.Gibbs,i87i,6Det,587 569; 18. " 27 high. 



In 4 gradual fractioning, Oxide points to o.i low; but 

 purpureo-cobalt chloride points to as much high. If both 

 substances equal in value, Co = 59. 



Cr = 52. CHROMIUM. 



Cr2 Oa : Am2 OT Cr2=i52 : 252=0.60 318. Chg. 31 high. 



1 Rawson, 6 Det., 368 330; 38. Mean 28 high. 



2 Meinecke, 1891, 5 Det, 353 320; 33. " 14 high. 

 Cr2 Oa : Ag2 O? Cr2=i52 : 432=10.35 185. Chg. 30 high. 



3 Berlin, 1846, i Det., 121 high. 



4 Sievert, 1861, 2 Det, 262 139; 123. Mean 16 high. 

 Cri Oa : 2 Ag O* Cmi52 : 664=0.22 892. Chg. 23 high. 



5 Berlin, 1846, 4 Det., Mean 122 high. 



6 Sievert, 1861, Shows why high. 



7 Meinecke, 1891, 6 Det, 943 924; 19. Mean 39 high. 



These are the only determinations worth consideration ; 

 the final product is the sesquioxide, obtained by ignition. 

 They suffice to fix the unit. 



Cs=133. 



CESIUM. 



Cs Cl : AgCl = 168.5 : H3-5 I-I7 421. Chg. 70 high. 



1 Johnson & Allen, 1863, 4 Det, 580 399; 181. Meati78high. 



2 Bunsen, 1863, 3 Det, 503 435; 68. " 46 high. 



3 Godefroy, 1876, 4 Det., 265 107; 158. " 257 low. 



Bunsen's mean corresponds to 133.06. 

 But since only the silver chloride process has been 

 employed, this result is not final. 



