258 IODINE. 



In -113.5. INDIUM. WINKLEfl. 1867. 



Iri2 : Iti2 Os = 227 : 275 = 0.82 546. Change 13 high. 

 Winkler, 1867, 3 Det., 581 537; 44. Mean 10 high. 



Bunsen, 1870, i Det., 589. " 43 high. 



The radio-tests of Benoist (C. R. 132,772; 1901), confirm 

 it to be a sesquioxide. 



The work of Winkler needs being confirmed. His two 

 gold-substitutions 



In : Au= 113.5 : J 97 = 0-57 614 



gave values rather high, namely, 208 high ; but we know that 

 this process cannot give accurate results. 



10 = 1 27. IODINE. MARIGNAC, 1 842. 



Ka lo : Ag = 166 : 108 1.53 704. Change 92 high. 

 Marignac, 1842, 5 Det., ^94 651; 143. Mean 5 low. 



This corresponds to only 0.005 on Iodine. 



Clarke (1897, p. 48), says this work of Marignac was 

 "without remarkable accuracy." The range is rather high, 

 but the mean is all right, and that is what Clarke always 

 wants; even his own probable error of this mean is only 18 

 in our units; but that corresponds to 0.02 only on the atomic 

 weight, which ought to be good enough. 



Ag. lo : Ag = 235: 108 = 2.17 593. Chg. 92 high. 

 Marignac, 1842, 3 Det., 519 500; 19. Mean 59 low. 

 Stas, 1865? a, 2 Det., 536 529; 7. " 60 low. 



b, 6 Det, 543 530; 13. " 56 low. 



c, 5 Det., 539 529; 10. " 60 low. 

 Since Clarke has pleased to throw his reproach upon 



Marignac, we here take these determinations from the 

 Rumpel Kammer, to show, that Marignac's work was equal 

 to that of Stas, as even Clarke has to admit (1. c., p. 49). 



All these determinations are about 60 low, which repre- 

 sents 0.06 low on the atomic weight of iodine, as readily seen. 



Ir 193. IRIDIUM. 



Ir : Ka2 Cl Ir = 193 : 484 = 0.39 876. Chg. 12 high. 

 Seubert, 1978, 8 Det., 890 = 868; 22. Mean 4 high. 



The corresponding Ammonium Salt gave values 67 high 

 in mean, but deserve less credit. 



For 192.5, the atomic ratio is 0.39814. 



