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On the TENDENCY of ELAS- 

 TIC FLUIDS to DIFFUSION 



through each other. 



By JOHN DALTON. 



Rcail Jan. 13, iSoj. 



In an early period of pneumatic chemistry it 

 was discovered that elastic fluids of different 

 specific gravities being once diffused through 

 each other, do not of themselves separate, by 

 long standing, in such manner as that the 

 heaviest is found in the lowest place j but on 

 the contrary, remain in a state of uniform and 

 equal diffusion. 



Dr. Priestley has given us a section on this 

 subject (vid. Experiments and Observations. 

 &;c. abridged. Vol. 2. page 441) in which he 

 has proved the fact above-mentioned in a satis- 

 factory manner ; and every one's experience 

 since, as far as I know, has coincided with his 

 conclusions. He has not offered any conjecture 

 concerning the cause of this deviation from the 

 Kk2 



