Those values and I ho (h'vialioiis of /y oalouhilod uilh ihoni arc 

 o-iven ill Ihe fifth oohuoii ..f labh' 1. Tlio doviatioiis are of the same 

 order as those which Prof. Kamv.klinoh Onnks ^) obtains when repre- 

 sent iiiii' AMA(iATV observations by an equation of state with six 

 constants in ihe form of a series. 



A reliable extrai)olation for pressures below 100 ats. has now 

 become possible; at a temperature of i5\7 (Mhe pressure correspon- 

 ding to every volume can be determined with the aid of tlie five 



constants. 



If the air-manometer is placed in a water bath, the temperature 

 of which is kept constant by a thermo-regulator, a temperature of 

 20° or 25^^ will be preferred to 15°,7 C. It is therefore of importance 

 to ascertain, whether also at those lii-hcr temperatures thee(iuation 

 of state with the same live constants yields values which sufficiently 

 harmonize with Am u^vr's observations. It is to be expected that 

 this will only be possible within a limited range of temperatures; 



1) These Proc. lY June 29, 1901. p. 125. 



