184 



The Philippine Journal of Science 



1913 



c " Oscillation frequencies. 



■B 16 18 2000 22 24 26 28 3000 32 34 



I 3.6 



— : t 



» '• \ 



\ '. 



\ -. * 



\\ ■. V_ __J 1 



\\\ 



\* '■■■ /' v *. 



Yxu. V 



1,000 | 



-3.4 



3.2 



3.0 



2.8 



2.6 



2A 



■5 2.2 



Fig. 5. Salts of white phthaloxime in pyridine containing 14 per cent water. 

 Full curve = silver salt. 

 Dash curve = potassium salt. 

 Dot curve = sodium salt. 

 Dash and dot ourve = ammonium salt. 



Description of fig. 5. — These curves bring out the difference 

 in persistence and width of the color band and the corresponding 

 residues of the ultra-violet oxime band. Since there is very little 

 difference in the persistence of the latter in each case, it is reason- 

 able to assume that the hydrolysis of the salts does not vary 

 greatly in this solvent. The width of the color band and the 

 dilution at which it appears are very different, especially with the 

 weak ammonia base. These curves bring out the effect of dif- 

 ferent substituents and the relation between color and positive 

 affinity better than any other series we have obtained. The ad- 

 dition product of silver salt and pyridine has been largely de- 

 stroyed, and the absorption curve now heads at approximately 

 the same point as that of the normal salts. 



A solution of silver salt in alcoholic ammonia was prepared and 

 photographed. The curve of its absorption spectrum falls be- 

 tween that of silver salt in pyridine and silver salt in pyridine con- 

 taining 14 per cent water. This solution is unstable, and rapidly 

 loses its red color with the formation of metallic silver. The 

 addition product may be obtained by passing dry ammonia over 



