1057 
by which the concentrationdiagram-type is defined. When we wish 
a definite example, we may take among others: 
QB LFA3G=4B4C+4D 
Ft9GtA=2B42C47D 
wherein the coefficients satisfy (14), (15) and (16). 
Now we take a system with 5 components, in the invariant point 
of which the phases P, Q, R, S, 7, U, and V oceur; we take 
fig. 1d for the type of the P,7-diagram. 
When we take (2) and (U) as position-curves, the equations of 
the reactions are: 
uU+tsStgqgQ=pP+tT+vV 
sStq7QtrR=pP+tT4r'v. 
De reaction-coefficients have to satisfy: 
utstq=p+t+v 5 SHgAr=p ttr 
and 
p' bes Sg 
EE a 
Pet, 8 ge 
by which the type of the concentration-diagram is defined. We may 
take among others as a definite example: 
3U4+581+Q=—4P437T42V 
78S+2Q+8R—2P4+3T7T47V. 
These are viz. the reaction-equations (15) and (18) which we have 
used in communication IV for the deduction of fig. 1d {symbolically 
represented in communication IV by (20) and (21). 
As third example we take a system with 5 components, in the 
invariant point of which the phases A, B, C, D, EH, F, and G occur, 
for the type of the P,7-diagram we take fig. 2g. We take (A) and 
(HE) as position-curves, so that the equations of the reactions are: 
eH+fF+ 9G=bB4+cC4dD. 
fi'F+tgGtid@dAtvuB+ecC=dadD. 
The reaction-coefficients have to satisfy: 
bft = Fee dige, of tret eed 
bat: ieee. 
Hon re 
by which the type of the concentration-diagram is defined. 
We may take among others as a definite example: 
vs BO AD 
83F1+8G13A14B42C0=—20D. 
The reader may also easily apply these considerations to other 
types of the P, 7-diagram. 
Leiden, Anorg. Chem. Lab. (To be continued). 
