On the Distribution of a Gas in an Electrical Field. 529 



those calculated from my measurements ; in the second and 

 third those found by Olszewski and Estreicher. Those given 

 as Estreicher's are obtained by giving weight to his inter- 

 mediate points, as explained above. 



The values of the vapour-pressures of oxygen and nitrogen 



were introduced into the equation r' gas = rx p- , but were 



not found to satisfy it, nor does the introduction of a constant 



factor improve it, as may be seen from the subjoined table, 



r 1 /P 

 the last column of which expresses the ratio — rpr~* 



T. 



r'. 

 •1364 



r. 





r' 

 r 





80 



•5004 



•2174 



•2725 



1-254 



82 



•3089 



1090 



•2240 



•2832 



1-264 



84 



•5835 



1-959 



•2322 



•2979 



1-283 



86 



1092 



3-505 



•2388 



•3116 



1-305 



88 



2-290 



7-065 



•2480 



•3241 



1-307 



90 



8-806 



2497 



•2560 



•3525 



1-377 



There does not appear, therefore, to be any connexion 

 between the ratio of the vapour-pressures and the composition 

 of the gaseous phase in the distillation of oxygen and nitrogen 

 at constant pressure ; it would be better, however, for this 

 purpose to investigate the distillation at constant temperature, 

 and this it is proposed to do. 



I have to express my cordial thanks to Professor llamsay, 

 at whose suggestion the work was begun, and who has shown 

 great personal interest during the investigation; and especially 

 am I indebted to Dr. F. Gr. Don nan for the valuable help he 

 has given me at various times. 

 University College, London, 

 February 1000. 



LII. On the Distribution of a Gas in an Electrical Field. 

 By George W. Walker, B.A., A.R.C.Sc, Sir Isaac 

 Newton Student in the University of Cambridge * . 



THIS paper forms part of an essay on the kinetic theory 

 of gases, at which I have been working for some time. 

 The essay will not be published for some time yet ; but on 

 account of the interest of the above question it seems desirable 

 to publish the results at which I have arrived. 



* Communicated by the Physical Society : read March 9, 1900. 



