446 



On the Compressibility of Gases. 



The gall bladder presents a very striking instance of the equivocal or 

 antidrome blaze current. 



In conclusion I should like to be allowed the pleasure of thanking 

 my husband for continual help and sympathy in my work, and to 

 record my appreciation of and gratitude for the method of investigation, 

 and simplified arrangement of electrical apparatus which renders it easy 

 to study the many fascinating problems of animal and vegetable 

 electricity. 



* On the Compressibility of Gases between One Atmosphere and 

 Half an Atmosphere of Pressure." By LORD RAYLEIGH, 

 O.M., F.R.S. Received January 17, Read February 2, 1905. 



(Abstract.) 



The present memoir contains a detailed account of the observations 

 referred to in the Preliminary Notice of February, 1904. In addition, 

 results are now given for air, carbonic anhydride, and nitrous oxide. 

 In the following table are recorded the values of B for the various 

 gases at specified temperatures, B denoting the quotient of the value 

 of pv at half an atmosphere by the value at the whole atmosphere : 



By means of a formula given by D. Berthelot the compressibilities 

 at C. are inferred, and applied to deduce the ratio of densities as 

 they would be observed at C. under very low pressures. According 

 to Avogadro's law these are the relative molecular weights. From the 

 densities of nitrogen and oxygen we get N = H'008, if O = 16. 

 Again, from the densities of oxygen and nitrous oxide we find 

 N = 13-998. The former is probably the more trustworthy. 



