446 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



the usual metliods, as refined at Harvard University, and give tlie two 

 silver ratios. The data, with vacuum weights, are as follows : 



From Ag ratio, Co = 58,965. 

 From AgCl ratio, Co = 58.968. 

 And Ag:Cl:: 100:32.866. 



For the silver ratio, 2Ag: CoCL : : 100 : .r, there are two earlier sets 

 of determinations. The three series combine as follows : 



Marignac 60.118, ±.0192 



Dumas 60.228, ± .0110 



Baxter and Coffin 60.1975, ± .0006 



General mean 60.1975, ± .0006 



In this combination the older series vanish. Their influence is ap- 

 parent only in the fifth decimal place. . 



For the atomic weight of nickel Ave now have the following ratios : 



(1 



(2 



(3 



(4 



(5 



(6 



(7 



(8 



(9 



(10 



(11 



(12 



(13 



(14 



(15 



(16 



(17 



(18 



Per cent, of Ni in NiC,0,.3H20, 29.084, ± .006 



Per cent, of C0„ from Nia04.3H„0, 44.098, ± .027 



Per cent, of Ni in NiCA-2H„0, 31.408, ± .0026 



Per cent, of CO, from NiC,0^.2H,0, 47.605, ± .053 



Per cent, of Ni in brucia nickelocyanide, 5.7295, ± .0034 



Per cent, of Ni in stryclinia nickelocyanide, 6.595, ± .005 



Per cent, of NiO in NiSO^, 48.269, ± .018 



Per cent, of Ni in NiO, 78.570, ± .0006 



2Ag:NiCL: :100:60.194, ± .0061 



2AgCl:Ni: : 100: 20.590, ± .0049 



2Ag:NiBr„: :100:101.270, ± .0015 



2AgBr:NiBr2: : 100: 58.1738. ± .0007 



NiBr,:Ni: : 100: 26.855, ± .0005 



2Ag:Ni: : 100: 27.359, ± .0059 



2Au:3Ni: : 100: 45.209, ± .019 



2BaS04 :K,Ni( SO,), . 6H._,0 :: 100: 93.6505, ± .001 



Ni:H.::100:3.4211, ±.001 



Ij:Ni:: 100: 23.255, ±.0091 



