238 BROMINE. 



Bo=11. BORON. RAMSAY, 1893. 



We have given all necessary data and methods very fully 

 in Part III, pp. 141-159. 



We may add the determination by water of crystallization 

 of borax on account of its historical interest (compare pp. 

 42-44) Borax = Naz O? Bo4 -\- 10 H2 O. 



Water: Borax == 180 : 382 = 0.47 120. 



Berzelius, 1826, 3 Det. Mean 10 low. 



Laurent, 1849, 2 Det - " 55 hi g h - 



Hoskyns-Abrahall, 1892 : 



5 Det., 230 high; 87 high. " 167 high. 



Ramsay and Aston, 1893 : 



7 Det., 83 high ; 10 low. " 48 high. 



These three series were made in connection with deter- 

 mination of Cd, Cu, Ba. 



Other, perfectly concordant determinations by Cooke 

 (Sb), Thorpe (Ti), Thorpe and Laurie (Au) can only be 

 mentioned. 



It will be noticed, that Marignac-Huntington, and Stas- 

 Richards' (2) exactly balance. 



The atomic weight of bromine has long been known 

 to be exactly commensurable to that of silver, namely, 

 Br : Ag = So : 108 = 20 : 27. 



All other work done is either not direct or has been 

 properly placed in the Chemische Rumpelkammer. 



We have no space for either here. 



