1910-11.] Absorption of Light by Inorganic Salts. No. IV. 553 
CoF 2 2H 2 0. 
CoC 1 2 6H 2 0. 
CoBr 2 6H 2 0. 
CoI 2 2H 2 0. 
c . 
A. 
A. 
c . 
A. 
A. 
c . 
A. 
A. 
c . 
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1-79 
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99 
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149 
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116 
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74 
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51 
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27 

Co (N0 3 ) 2 6H 2 0. 
CoS 0 4 7H 2 0. 
Ni(N0 3 ) 2 6H 2 0. 
NiS0 4 7H 2 0. 
c . 
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c . 
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c . 
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c . 
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9-87 
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5-60 
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3-94 
1 
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1-58 
