[ 529 ] 



LXIV. Sotc on '' Mininuo)} Deviation throuoh a Fri,s) 

 Bii R. Chartres*. 



A 



^+(^ = minimum. ^'+0'=coustant. Sin ^=/x sin ^'. Sin(^ = |:isin 0'. 



MakeFCB = 6>, FBO = ^, 

 then F is to be a maximum^ while D is constant. 



cosF-co3D="'K-^) 



^n' 



is a minimum. 



■xy 



\ 



^ 



xy 



maximum . 



.-. x = y, or (9' = ^', 



or 



e= 



L 



LXV. Mr. J. H. Jeans' Theory of Gases. (Note on his 

 wA Paper in Phil. Mag, June 1^03.) By S. H. Burbury, 

 F.R.S.-\ 



Mr. jeans proposes in this paper to put the Theory of 

 Gases on a new basis. 



The orthodox theory rests, he says, on the moleJadar 

 ungeordnet hypothesis o£ Boltzmann. But this has nevei' 

 been explained either by its author or by anybody else. And 

 Jeans concludes from Boltzmann's practice that the orthodox 

 theory is effectively based on what in my Kinetic Theory of 

 Gases I called assumption A. That assumption is that the 

 chance of any molecule having its velocities within assigned 

 limits is everywhere and at every instant independent of tlic 



* Communicated by the Author. 

 t Communicated by the Author. 



Phil. Mag. S. 6. Vol. 6. No. 34. Od. 1903. 2 M 



