182 



General con- 

 clusions. 



ON THE EXPANSION OF MOIST AIR. 



133 grains of sulphate of lime, containing 78*4 grains of 

 sulphuric acid, or 58*6 per cent. 



These results, though not in perfect accordance with those I 

 had previously obtained, I considered as sufficiently exact 

 to establish their general accuracy; and I did not think it 

 necessary to verify them by more careful repetition, in which 

 it is possible these slight differences might have wholly dis- 

 appeared. 



The experiments detailed in this paper then confirm, with 

 trifling variation, the results already obtained byWithering, 

 Klaproth, Kirwan, Clement and Desormes, and others; 

 and prove, 



J. That carbonate of barytes, both natiye and artificial, 

 is com 1 osed of carbonic acid 21*75, barytes 78*25. 



2. That nitrate of barytes is composed of acid and water 

 40*7, barytes 59*3. 



3. That calcined sulphate pf lime contains sulphuric 

 acid 58, lime 42. 



4. And lastly, that calcined sulphate of barytes is com- 

 posed of sulphuric acid 33, barytes 67. 



Church Bridge, near Blackburn, 



IV. 



Experiments on the Expansion of moist Air raised to the 

 boiling Temperature. In a Letter from John Cough, 

 Esq. 



To Mr. NICHOLSON. 

 SIR, 



Objections to JJ^ERHAPS you will recollect, that I proposed some 

 the new doc- A . * ••■ ' . ■ \ ^ 



trine of the time ago in your Journal* various objections to the new doc- 



con-mtuticn of irine respecting the Constitution of the Atmosphere, and 

 phere, the independent equilibrium of its component gasses. The 



intention of these objections was to invalidate the hypothe- 

 sis, by showing its inability to explain natural phenomena; 

 and at the same time to point out certain palpable absurdi- 



f Vol. XVI, p. 4. 



ties. 



