THE ABSORPTION SPECTRA OF VARIOUS POTASSIUM, 

 URANYL, URANOUS AND NEODYMIUM SALTS IN 

 SOLUTION AND THE EFFECT OF TEMPERA- 

 TURE ON THE ABSORPTION SPECTRA OF 

 CERTAIN COLORED SALTS IN 

 SOLUTION. 



(Plates VII. to XIV.) 

 By harry C. JONES and W. W. STRONG. 



(Read April 24, 1909.) 



(A report on part of the work on absorption spectra that is being 

 carried out with the aid of a grant from the Carnegie Institution of Wash- 

 ington.) 



Outline. 

 I. Experimental Methods. 

 II. Absorption Spectra of Potassium SaUs in Aqueous Solutions. 



III. Absorption Spectra of Uranyl Nitrate (under Different Conditions). 



(a) In Aqueous Solution. 



(b) In the Crystalline State. 



(c) As Effected by Dilution. 



(d) In Methyl Alcohol. 



(e) In Mixtures of Methyl Alcohol and Water. 

 (/) In Ethyl Alcohol. 



(g) As an Anhydrous Salt. 



IV. The Absorption Spectrum of Uranyl Bromide, Uranyl Acetate and 



Uranyl Sulphate. 



(a) Uranyl Bromide in Water. 



(b) Uranyl Acetate in Water. 



(c) The Uranyl Bands of the Acetate. 



(d) Uranyl Sulphate in Water. 



V. The Absorption Spectrum of Neodymium Chloride in Glycerol. 

 VI. The Absorption Spectrum of Uranyl Chloride. 



(a) In Water. 



(b) As an Anhydrous Salt. 



(c) The Characteristic Bands in Water. 



(d) As Affected by Calcium and Aluminium Chlorides. 



(e) In Methyl Alcohol. 



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