212 
Proceedings of Royal Society of Edinburgh. [sess. 
notation, we have £=1*61, I = T8 in curve 1 ; and £=1-55, 1 = 1*9 
in curve 2. The distances for maximum attractive force (as shown 
by the points of inflection of the two curves) are 1’68 for curve 1, 
and T76 for curve 2. 
According to our notation of § 4 we have y = <£(D), if x = D in 
each curve. 
§ 15. The two formulas (7), § 12, are represented in fig. 4 for 
curve 1, and in fig. 5 for curve 2; with x = \ for Ass. I., and 
iC='613A. for Ass. II. In each diagram the abscissa, x, is distance 
between nearest atoms of the assemblage. The heavy portions of 
the curves represent the values of w calculated from (7). The 
light portions of the curves, and their continuations in heavy 
curves, represent 4 and 12 g>(x) respectively in each diagram. 
The point where the light curve passes into the heavy curve in 
