( 462 ) 
point-curve of the -binary mixture represented by the y-axis, then 
the binodal curve too has got detached from the y-axis, and the two 
branches of the binodal curve have united toa single curve. In fig. 6 
the drawn curve KC represents the projection of the double-points 
and the curve DPE’ the binodal curve. 
From what has been observed for a binary mixture appears that 
the projection of the spinodal curve, touching the binodal curve in P, 
must have the shape as indicated by the dotted line. So the projection 
of the binodal curve must have a double point lying on the projection 
of the double-points or near it, and so further from P the two branches 
of the spinodal curve have interchanged their relative position. 
What is such a configuration to be called? At the final point, 
so in the neighbourhood of P it has entirely the properties of a 
A x 
plait. There is a plaitpoint, a connodal and a spinodal curve, which 
are placed in the usual way with regard to each other. Every plane 
section between the points P and K cuts the ¢-plane along a curve 
which has two points of inflection. But so great a modification occurs 
at a great distance from P, that we can only recognise a plait in 
it by comparison with the parts near P. This plait has then been 
subjected to a transformation. We could viz. in a plait make the 
two binodal branches approach each other, so that the convex-convex 
parts preserve their dimensions nearly or quite up to a certain 
distance from the spinodal curve, but the whole convex-concave 
