110 Dr. Kane on Combinations derived from Pyroacetic Spirit. 



oxalate of lime, collected and burned with the filter, gave 0,244 of carbonate of 

 lime, containing 0.1374 of lime, or 23.7 per cent. 



When this salt is warmed with nitric acid, the decomposition is always accom- 

 panied with a slight puffing explosion, owing to a very rapid sort of combustion 

 pervading the whole mass. Consequently a quantity of the light residual sul- 

 phate of lime is always thrown out of the crucible. The residue is, however, quite 

 neutral, and no free sulphuric acid is given off. In two experiments of this 

 kind the quantities of residual sulphate of lime, although a portion had been lost, 

 were 47 and 53 per cent. 



B. 0.765 of the dried salt gave 



0.304 water, and 



0.848 carbonic acid, 

 corresponding to 



Hydrogen = 4.40 



Carbon = 30.29 per cent. 

 The formula SO3-I- CgHjO + cao gives 



so3 = 40.16 33.8 



cao= 28.52 24.1 



Co = 36.80 31.0 



Hj = 5.00 4,2 



o = 8.00 6.9 



118.48 100.0 



The 7.2 of water of crystallization, obtained above, corresponds to one atom ; 

 the formula of the crystals therefore is 



SOj-j-CgHsO-l-CaO-l-HO. 



A circumstance in which the salts above described differ from the analogies 

 of the sulpho-vinates, sulpho-mesitylates, and sulpho-napthalates, is that the 

 quantity of the inorganic base is sufficient to neutralize the whole of the sulphuric 

 acid. It is on this account that I have given to the acid first described the name 

 of Persulpho-mesitylic ; as the word Bisulpho-mesitylic might imply that the 

 quantity of acid was double that necessary to neutralize the inorganic base present 

 in the salt. 



On decomposing the baryta salts of the sulphate or of the bi-sulphate of 



