Manchester Memoirs, Vol. lix. (191 5), No. 12. 53 



Sheet 14 



Names and formulae for some acids, with their weights. 

 In the modern symbols these are as follows : 



19 



34 



J 9 



26 



3i 



22 



29 



23 

 C. 2 H 2 2 Acetic acid ... ... ... 26 



On the back of this sheet are the words, in Dalton's 

 handwriting, " Old Chemical." The formulae, names and 

 weights correspond closely with those of 18 10 ("New 

 System," I., ii.), but are much different from those of 1827 

 ("New System," II., i.). The last line, relating to acetic 

 acid, has been attached to the rest of the sheet by paste. 



CO, 



Carbonic acid 



so 3 



Sulphuric acid 



N0 2 



Nitric acid 



N0 3 



Oxynitric acid 



N 2 3 



Nitrous acid 



H0 3 



Muriatic acid 



H0 4 



Oxymuriatic acid 



P0 2 



Phosphoric acid 



Sheet 15. 



Symbols for sulphur, oxygen and hydrogen, and 

 formulae for some compounds formed by their 

 union. 



Using modern symbols, the list becomes : 

 SO Sulphurous oxide. 

 SO. Sulphurous acid. 

 SO ;J Sulphuric acid. 

 HS Sulphuretted hydrogen. 



The first of these was supposed by Dalton to be pro- 

 duced as a bluish white substance, in admixture with 

 yellow sulphur, when sulphurous acid and sulphuretted 

 hydrogen are brought together. (See " New System," I., 

 ii., 383 et seq.) It has proved to be in fact "milk of 

 sulphur." 



