614 DE. A. DTJPEE AND E. J. PAGE ON THE CHAEACTEES OF MIXTITEES. 
The horizontal lines in Curves 1-5 have the same significance as in the upper half, except 
that they give the deviations of the numbers found from the theoretical mean, instead of 
the numbers themselves. 
Curve 6 gives the heat produced by mixing, the horizontal lines representing units of 
heat. 
The zero line represents the mean value of all the properties. 
Those belonging to subclasses a and c, specific heat, heat produced by 
mixing, and rate of expansion, are distinguished by a small circle round the 
points directly ascertained by experiment; while those belonging to sub- 
classes b and d, boiling-point, capillary attraction, and compressibility, are 
similarly distinguished by a cross. 
