( 403 ) 



lliat "liiuxUy tliis ensemble will be uniformlj scattered ovei' all the 

 combinations of place. In this case there will again be a partial 

 entropy Sp whicli has become minimum. 



We may try to make use of Boret/s way of representation also 

 here, and shall take as introductory case an ensemble of systems 

 consisting of 2 molecules moving along the same line perpendicular 

 to two parallel walls between these walls. 





1^/. 



^z 



Fig. 3a 



Fig. 3b 



Fig. 'S" represents one system from the ensemble, tig. 3^ the motion 

 of the ^vhole ensemble, when the dimensions of the molecules are 

 disregarded. Originally all the systems are in an element placed at 

 ^%^\> ^'\), the points of velocity lying ^vithin an arbitrary tigure. 

 Here the representing points will be found after 1 sec, whereas 

 they woidd occupy a continually extending tigure if there was no 

 collision. Collision of the molecules with the walls is here represented 

 by collision of the re])resenting points with the lines OA and AB, 

 collision of the molecules inter se by collision with the line OB. 



Now, however, we may also think the motion after the collision 

 e.g. with A/) continued past AB, if the triangle ABO which 



