10 Mr. Nicholson on the 



subject to the difficulty above adverted to as to the determi- 

 nation of the constants introduced by the operations. 

 Similarly, the solution of the third example, 



is j/ = (D^ + ^y- ' 1^^ (D3 + F) -p.oT , 



which will be found to be 



« and /3 being the imaginary cube roots of — 1. 

 The solution of the fourth equation, viz. 



will be found to be 



where a. and /3 are the roots of /^ + 2w^ + 2?«^ = 0. 



A similar correction may be applied without difficulty to 

 the other equations discussed by the author of the paper in 

 question. 



I am, Gentlemen, 



Your obedient Servant, 

 69 Chancery Lane, Dec. 3, 1846. Charles James HaiigkEAVE. 



v. On the Compounds of Phosphoric Acid with Aniline. 

 By Edward Chambers Nicholson, Esq.'^ 



f\P the inorganic acids there is none so remarkable for the 

 ^^ number and variety of the compoimds it forms with bases 

 as phosphoric acid. The peculiar and complex reactions of 

 the salts of this acid ^Tere first satisfactorily explained by Prof. 

 Graham, in his well-known paper published in ISSSf. The 



• Communicated by the Chemical Society; having been read May 18, 

 1846. 



t I'liil. Trans, of Royal Socioty of London, part 2. 1S33. Researches on 

 the ,\rseniates, Phosphates and Klodifications of Phosphoric Acid, by Tlios. 

 Graiiam, Esq., M.A., F.R.S.E., Professor of Cliemistry in the Andersonian 

 University of Giaagow. 



