524 Dr. E. J. Mills on Elective Attraction, 



(5) If the energy of elective attraction be directly as symbolic 

 valuCj it ought to vary inversely as specific heat. 



According to a carefully prepared Table given in Lothar 

 Meyer's Die modernen Theorien der Chemie (p. 48)^ the mean 

 value of the product of symbolic value into specific heat (exclu- 

 ding the usual anomalies) is 6*246. The identity of this number 

 with the first term in the Q series is unmistakable. Again^ in 

 a large majority of cases, lis stand for specific heat, Xs = ?^6•25, 

 n being integral. I find that in my results m is greater than n. 

 Let m = xn. Then 



Q = ^?z6*25, 

 and 



25 = ?i6-25; 



.*. Q=^2)5, 

 and 



Q x^s xs 



the expression for the energy of elective attraction in terms of 

 specific heat. Comparing the coefficients [a, a!) for any two 

 nitrates, the following relations are obtained : — 



a __^w} ^ _ x's' 

 «' m ^' xs 



Where m:=m' and x=.x'j we have the simple expression 



a'"!' s' 



The following instances may be adduced in verification of the 

 latter case : — 



a. (potassic nitrate) t t ^ i ,i -11^^- 



— ^7 — r ■ r-^=l'17 by the method 01 ratios. 



~ a (sodic nitrate) *' 



= .-^ggg =1-17 by specific heat; 



— ^— ^ { =:l-59 by the method of ratios, 



« (argentic nitrate) '' 



= ttqIo =1*^^ ^y specific heat. 



In the case of the other nitrates, which require the previous 

 formula, I find the verification to be equally satisfactory. If 

 the reader should desire to perform the calculation, he will 

 observe that w = 3 for plumbic nitrate, and ?i = 4 for the other 

 nitrates; ^s = 25'Q0. 



(6) The experimental values of a lie between the limits in- 



