( 444 ) 



If in - = we take the lower temperature 1 = — , and in 

 dv* k 



d*ip , „, T 



- =:() the value of' the lower temperature 7"' = , we obtain hv 

 da? ' /•' 



elimination of T, the equation, which with a slight modification 



agrees with (2) of Contribution X: 



--jl-.(l--)- - -26. + 6' i.-,l -.) J = 



0. 



It' we now treat this equation in the same way as («) was treated 

 iu Contribution X, we get, for th<' case that the closed curve con- 

 tracts to one point, the condition : 



1 = 



/■ 



k 



So the same parabola as before, only shifted in the direction of 



k' — k 

 the two axes l>\ an amount equal to 



K 



The value of 7' at which the imitated plaitpoints coincide in this 

 calculation, is now /• or /■' times higher. 



[To be continued)* 



B R R A T I M. 



In the proof' that the closed curve, the locus of the points of 



d*y </'-•«!• 



intersection of - =0 and = 0, always lies at v <T 0-, a possible 



dv* -/./■■• ' ' 



case has heen overlooked. Tlie value r <^ b, may occur if: 



n — 1^> |/l-fê, -\- n \Ze, , 

 a^ will be shown in the Continuation. 



(December 23, 1908). 



