Chemical Science. 389 



The sulphurclted hydro-cyanic acid is composed of 



Hydrogen 1.68 2 atoms 12 44 



Nitrogen 23.85 1 atom 177."26 



Carbon 20.30 2 atoms 150.66 



fiulphur 54.17 2 atoms 402.32 



^00. 772 68 



In considering the nature of these substances, M.' Berzelius 



seems ,„ehned to admit that view of them and theh- natu e 



h.dws analogous to the chlorine theory, as also this "heory 



tself, and goes a considerable way towards answering some of 



those objecfons wh.ch have been raised at different tiLs to t 



On sub.Mtutmg selenium for sulphur in these and analogous 

 experiments, results which might have been expected Ion 

 the analogy of the two bodies took place; on headng it wUh 

 Si 7^7'';^'' «f Potassa, aselenio-cyanuret of potLsa was 

 ei::^ x'vi.lS^"'''^^"^ '' '''' sulpL-cyanuret'-^";i: 



}Jj f^-'''^P^'''(^. 0/ Alumina and Potassa.— This salt has 



Anat^ole Rifr'T"??' ^"'^ '^^ constitution made out by M 

 Anatole RifFault. It was prepared by addin- potassa to a 

 boihng solution of alum unrU Larly saturated; ^a precipitate 

 w I' '^ L r^^'" ^'" ^"^'^^^ ^"d died at a heat bebw S 



whfch acc'Jrdstitr ''■''"'' ^''^''^ ''''''•' ^^^ '''''■' 

 1 atom sulphate of potassa 109.10 19.654 



3 atoms subsulphate of alumina 344.84 52116 

 9 atoms water . . . loi.ig 18.230 

 Witt , ;. ?^ the nature of this salt, and such its accordance 

 with the atomic theory, attempts were made to produce a 

 similar compound of sulphuric acid and alumine with ammonia 

 I his was obtained by pouring solution of ammonia into a 

 bo.l.ng solution of arnmoniacal alum. The precipitate, when 

 well washed and dried, was analyzed, and found to coi^sist of 

 sulphuric acid 38.248, and of alumina 37.851 per cent., which 

 accords very nearly with the full or theoretical number 

 4 atoms sulphuric acid . . 200.46 38.724 

 9 atoms alumina . . . I94.49 37.572 

 1 atom ammonia . . ' , 21.55 4 164 



9 atoms water . . . loijs 19540 



517.69 100 

 Ann. de Chiniie. xvi. p. 355. 



8. Analysis of Verdirfris.-Mr. Phillips has lately analyzed 

 the acetate of copper by the following process. A given weight 

 Vol.. XI. 2D ^ » 



