174 



THE ATOMIC WEIGHTS. 



In strychnia cobalticyanide, Co.,C\\.^( C .jiH^i'^V^O.^),-^. H ^.S il ,,0. 



4.583 

 4-596 

 4-554 

 4-564 

 4-577 

 4-549 



Mean, 4.5705, rb .005 



111 pitrpureo-cobalt chloride, Co^{NII.^)^f^C!f^. 



23-575 

 23-587 

 23.586 

 23-579 

 23-569 

 23.581 



Mean, 23.5795, =fc .0019 



The last series may be combined with Sommaruga's, thus 



.006 

 .0019 



Sommaruga 23.827, 



Lee 23.5795, 



General mean 23.6045, ± .0018 



In discussing the atomic weights of nickel and cobalt, we 

 may ignore the work of Rothhoff, Erdmann and Marchand 

 and Deville. That of Marignac must also be omitted, for' 

 want of sufficient data. For nickel we have the following 

 ratios. The probable error assigned in No. 4, is that of a 

 single experiment in No. 2 : 



NiC20^.3H20, 29.084, 



(i.) Per cent, of Ni in 

 (2.) 



(3 

 (4 

 (5 

 (6 



(7 



(8 



(9 



(10 



Ag : NiClj 



006 



CO.^ from " 44.098, i .027 



Ni in NiC.p^.2lI.p, 31.4076, ± .0026 

 CO., from " 47.605, ± .053 



Ni in NiO, 78.593, i .0018 



" brucia nickelocyanide, 5.7295, d: .0034 

 " strychnia " 6.595, i .005 



: 100 : 60.1992, zb .0062 



Ni : 

 Au 



H : 



Ni 



100 : 3. 411, ± 

 : 100 : 45.209, 



.001 

 fc .019 



) BaSO^ : K.^Ni(S0j.,.6H.,0 : : 100 : 93.6505, ± .001 



Since the proportion of water in the oxalates is not an 

 absolutely certain quantity, the data concerning such salts 



