

Theory. 



Exp. 



60-0 



27-63 



27-67 



4-9 



1-71 



1-95 



40 



18-18 



18-82 



116 



S2-4.8 



51-56 



= 60 



58-16 



4 



3-80 



40 



38-04 



218 Moris. R. Piria on the Combinations of Salicyle. 



was dried and submitted to ultimate analysis, and was found 

 to consist of 



Atoms. 



Carbon 10 



Hydrogen .... 4 



Oxygen ...... 5 



Oxyd of silver 1 



Atomic weight . . . 220 100 100 



hence the acid itself consists of 

 Atoms. 

 Carbon ... 10 

 Hydrogen . 4 

 Oxygen ... 5 



Atomic weight.. 104 100 



The aqueous solution obtained by washing the decomposed 

 salicide of potassium, during the separation of melanic acid, 

 was submitted to examination, and after evaporating it to a 

 small bulk, mixing it with sulphuric acid, and submitting it 

 to distillation, acetic acid was obtained, whilst sulphate of 

 potass was left in the retort. 



From these experiments, it appears, that salicide of potas- 

 sium, when moistened and exposed to the air, or to an atmo- 

 sphere of oxygen gas, is resolved into melanic acid and acetate 

 of potass ; and for every atom of salicide of potassium decom- 

 posed, an equivalent of acetate of potassa is produced. For 

 this decomposition to be understood, we must admit that 

 three atoms of oxygen and the elements of two atoms of 

 water, are appropriated by each equivalent of the salicide of 

 potassium, thus 



Carb. Hyd. Oxy. Potassium. 

 Melanic acid = 10 + 4 + 5+0 



Acetic acid = 4 + 3 + 3 + 



14 + 7 + 8+0 

 '" 2 atoms water = 2 + 2 + 



Minus -! 



14 + 5 + 6 + 

 3 atoms oxygen = 3 + 



14 + 5 + 3 + 

 1 atom potassa = 1 + 1 



1 atom of salicide potassium = 14 + 5+4 + 1 



