16 Nits ZEILON. 
actual fluid, presenting at the height h' above the bottom an abrupt change 
of density equal to 
ee tos. 
where o' and o" are the extreme densities, and h' and I are defined by 
the equations I, I', IT. 
Remark. The preceding investigation does not consern itself with 
the interesting question of the existence of other possible modes of 
vibration, introduced exclusively as a consequence of diffusion. It 
seems plausible that such modes may exist; and the conclusion may 
be drawn from above that, if existing, these modes will as a rule 
ENT - : 
correspond to great values of yi- for whieh our approximate method 
fails, It is easy to see that our equations give another positive and 
9 2905 à 
very great root yi but it is not possible, from the occurrence of that 
root, to draw conclusions with any bearing upon realities, for the same 
reason, viz. that the conditions imposed for the approximate treatment 
are no longer fulfilled. "The author hopes to return to these questions, 
in connexion with an experimental investigation, which is being carried 
out at the present moment, 
NH 
