Elastic Fluids to Diffusion. 261 



The only apparatus found necessary was a 

 few phials, and tubes with perforated corks ; 

 the tube mostly used was one 10 inches long, 

 and of iV inc^ t>ore ; in some cases a lube of 

 SO inches in length and 4 inch bore was used ; 

 the phials held the gases that were subjects of 

 experiment and the tube formed the connec- 

 tion. In all cases, the heavier gas was in the 

 tinder phial, and the two were placed in a 

 perpendicular position, and suffered to remain 

 so during the experiment in a state of rest ; 

 thus circumstanced it is evident that the effect 

 of agitation was sufficiently guarded against ; 

 for, a tube almost capillary and ten inches 

 long, could not be instrumental in propagating 

 an intermixture from a momentary commotion 

 at the commencement of each Experiment. 



FIRST CLASS. 



with Atmospheric Air, llijdrogenoiiSy Azotic 

 and Nitrous Gases. 



1. A pint phial filled with carbonic acid 

 gas, the 30 inch tube and an ounce phial, the 

 tube and small phial being filled with common 

 air, were used at first. In one hour the small 

 phial was removed, and had acquired no sen- 



3 



