I a Tendency of Elastic Fluids to Diffusion. 



one-h.'ilf filled wilh lime water, quite milky. There was 

 not any perceptible difTerciicc, whatever gas was in the 

 upper phial *. 



Second Class. 



Hydrogemits Gas, iv'Uli Atmospheric Air and Oxygenous 

 Gus. 



1. Tu'o six-ounce phials were connected by the tube of 

 a tobacco pij^e throe inches long, the upper containing hy- 

 drogenous jras, the lower atmospheric air: after standing 

 two hours the lower phial was examined ; the mixed gases 

 it contained made six explosions in a small phial. The gas 

 iu the upper also exploded. 



2. Two four-ounce phials connected wilh the ten-inch 

 small tube stood two days, having common air and hydro- 

 scn cas. Upon examination the upper was found to be 

 one-third common air by the test of nitrous gas. The gas 

 in the under exploded smartly ; that in the upper mode- 

 rately, with a lambent flame. 



3. Two one-ounce phials were connected by the ten-inch 

 tube, containing common air and hydrogenous gas : iu 

 three hours and a half the upper was about one-third com- 

 mon air, and the under tuu-ihirdsj the former exploded 

 faintly, the latter smartly. 



4. Two one-ounce phials were connected as above; the 

 under containing gas about three-fourths oxygenous, the 

 upper hydrogenous : in three hours the latter was one-fifth 

 oxygenous, and the former about one-half; the upper ex- 

 ploded violently, the riuder moderately. 



5. Two one-ounce phials were again connected, the 

 lower having atmospheric air, the upper hydrogenous gas ; 

 thev stood fifteen hours, and were then examined : the 

 upper gave rC7 with nitrous gas, the under 1*66. Hence 

 it is evident that an equilibrium had taken place, or tlie 

 two gases were uniformly diilascd through each other in 

 both phials. 



* The snail tube of tc i inches \vns then used, and a p'lial of common 

 E-r ; in oue liour niucli acid ^aa had come through, as sppvared by lime 

 water. 



Third 



