SILICON. 



26* 



8e=79. 



SELENIUM. PETTERSSON, 1877. 



Se 



Se 02 = 79: 111=0.71 171. Chg. 26 high. 

 Sacc, 1847, 3 Det., 161 102 ; 59. Mean 83 low. 



Ekman&Pettersson, 1876, 7 Det., 199185 ; 14. " 20 high. 



Ag2 : Ag2 Oa Se = 2i6 : 343 = 0.62 974. Chg. iSlow. 

 Ekman&Pettersson, 1876, 7 Det., ox 93x5 50. Mean 17 low. 

 Hg : HgSe = 200 : 279 = 0.71 685. Chg. 59 low. 

 Erdmann and Marchand, 1852 : 



3 Det., 741 726; 15. Mean 48 high. 



All other determinations without value. In the above 

 cases, the limit of precision is about o.i on the atomic weight. 



Si = 28. 



SILICON. 



THORPE, 1887. 



Chg. 24 high. 



Si O2 : Si Br4=6o : 348 = 0.17 241, 

 Thorpe and Young, 1887 : 



9 Det., 368 324'; 44. Mean 106 high. 



Si CU : 4 Ag= 170 : 432 = 0.39 352. Chg. 23 high. 



Pelouze, 1845, 2 Det., 457 433 ; 24. Mean 93 high. 



Dumas, 1860, 3 Det., 411 340571. " 25 high. 



Si Ch : 4 Ag Cl = 170 : 574 = 0.29 6*17. Chg. 17 high. 



Schiel, 1861, 2 Det., 633 592541. Mean 4 low. 



We credit the determinations to Thorpe, because of the 

 method, giving the oxide which is weighed as such; the 

 substance is unsatisfactory, and the result too wide of mark, 

 0.4. The problem is very difficult and not settled. 



Sn 118. 



TIN. 



: 118 = 



Sn O2 



Berzelius, 1826, 

 Vlaanderen, 1858, Reduct, 

 Dumas, 1859, Oxid, 2 Det. 

 Van derPlaats, 1885, Oxid, 3 Det., 

 Reduct, 4 Det., 



2 Det. 



1.27 119. 

 1.272. 



Van derPlaats, 1885, Oxid, 3 Det., 114091 ; 23. 



Reduct, 4 Det., 117086; 31. 

 Bongartz and Classen, 1888: 



Electr., ii Det., Oxidat. 



Chg. 23 low. 



Mean 37 low. 

 14 low. 

 20 low. 

 17 low. 



242 low. 



