( 553 ) 
throughout the space. For a homogeneous phasis this condition is 
satisfied. And when therefore the given quantity of substance is homo- 
geneously distributed through the space, we have a state of equilibrium. 
But if that state is to be realised the condition of stability must 
also be satisfied. From the principle that py must be a minimum, 
we derive for the condition of stability: 4) 
dw dw ow 
sr de tae du? bee Lay? Rn ed 
+ 2 - da dy >9%. 
dw dw 
oy Jo ET ay 
This condition can be brought under the following form : ?) 
Ps dw (FS) | 
1 (3 0” y Le ope vy P} 
Plon °° Tan © By de je iN a 4 
du? Gg 
3 (5%) | ge 4 aw oy | 
w_ \dy do P Jow _ dr dv dy ov . 
pe cr jad saul, Plan cn ne: „dy >0 . (3) 
do? de? 
Now follows from : 
df d 
Gs En, 
(5 ‚) = Ge) + (55) Ty & ) pry 
@)=-, 
ay | ey dvy _ 
Hante = cy 
and from: 
follows 
1) For a binary system the derivation of the condition of stability is given Cont. IT 
p. 8. Before that time in Théor. Mol. Arch. Néerl. XXIV. 
2) See Arch. Néerl. Série IL Tome II page 73. 
