254 



On Matter in the Gaseous and Liquid States. [Mar. 18, 



Table of Intensities. 



Scale No. Intensity. 



26 



7 



28 



14 3 



30 



48-0 



31 



75-0 



32 



100-0 



33 



95-0 



34 



66-5 



35 



43-0 



36 



37 5 



37 



25-0 



38 



33-5 



39 



28-5 



40 



25-0 



41 



20-0 



42 



18*0 



44 



12-5 



46 



10-0 



IV. "On the Properties of Matter in the Gaseous and Liquid 

 States under various conditions of Temperature and 

 Pressure." By the late Thomas Andrews, M.D., LL.D., 

 F.R.S. Communicated by the President. Received 

 February 7, 1886. 



(Abstract.) 



The following are the general conclusions to which this inquiry has 

 led:— 



1. The law of gaseous mixtures, as enunciated by Dalton, is largely 

 deviated from in 'the case of mixtures of nitrogen and carbonic acid 

 at high pressures, and is probably only strictly true when applied to 

 mixtures of gases in the so-called perfect state. 



2. The critical point of temperature is lowered by admixture with 

 a permanent gas. 



3. When carbonic acid gas and nitrogen diffuse into each other at 

 high pressures, the volume of the mixture is increased. 



4. In a mixture of liquid carbonic acid and nitrogen at temperatures 

 not greatly below the critical point, the liquid surface loses its curva- 

 ture, and is effaced by the application of pressure alone, while at 

 lower temperatures the nitrogen is absorbed in the ordinary way, and 

 the curvature of the liquid surface is preserved so long as any portion 

 of the gas is visible. 



