t)r. Thomas Andretcs : The Great Chemist 



127 



discovered between volume and pressure, the gas being compressed 

 at a constant temperature in each case. 



It is seen' that within certain limits of pressure the curve in 

 each case resembles an hyperbola, but that below the curve of 





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Fig. II. 



The undulating dotted lines show James Thomson's theoretical 

 isothermals for 13° '1 and 21° "5. 



