240 



EEPORT — 1901. 

 Appendix — cont. 



Substance 



Urea 



Uric Acid 



Veratrin 

 Victoria Blue 



CO(NH.,)., . 



C5H,N,03 . 



CjoH^aNOu . 



Formula 



u 



V 



Nature of 

 Absorption 



Reference 



Me,-N-CoH4 CioHe-NH.Ph 

 \/ /\ 



/ CI 

 /\„/ 



Meo-N-C^Hi 



Continuous 



Selective 



Selective 



J. L. Soret, Archives 

 des sciences phy- 

 siques et naturelles, 

 3rd Series (1893), 

 429; Hartley, loc. cit. 



J. L. Soret, loc. cit. ; 

 Hartley, Chem. Soc. 

 Trans' 51 (1887), 

 153. 



Hartley, Phil. Trans. 



II. (1885), 47 

 Lemoult, Gompt. Eencl. 



131 (1900), 839. 



w 



Distilled "Water . HoO 



Highly [ Hartley and Hunting- 

 diactinic ton, Phil. Trans. I. 



(1879), 257. 



Xanthine hydro- 

 chloride 



p-Xylene 



m-Xjlene . 

 o-Xylene 



C5H4N402.HC1 



CoHj(CH3)3 



CoH,(CH3)., 

 CuH4(CH5)., 



Selective 



Two bands 



One band 



J. L. Soret, Archives 

 des sciences phy- 

 siques et naturelles, 

 3rd Series (1893), 

 429. 



Hartley, Chem. Soc. 

 Trans.il {1885),685; 

 Pauer, Wied. Ann. 

 der Phys. 61 (1897), 

 363. 



The Methods /or the Determination of Hydrolytic Dissociation of Salt' 

 Solutions. By R. C. Farmer, Ph.D., M.Sc. 



[Ordered by the Council to be printed in extenso.'] 



It is a matter of common experience that many salts, although containing 

 equivalent quantities of acid and base, react acid or alkaline towards 

 indicators in aqueous solution. If we take, for instance, a salt such as 

 potassium cyanide and dissolve it in water, we find that, although it con- 

 tains the amount of hydrocyanic acid theoretically necessary to neutralise 

 the potassium hydrate, it reacts strongly alkaline, thus showing the pre- 

 sence of free potassium hydrate in the solution. 



A very superficial observation shows that the solution also contains 

 free hydrocyanic acid. Its presence is indeed rendered obvious by its 

 characteristic smell. It is therefore evident that the potassium cyanide 



