906 Dr. A. G. Crehore on 



where 



A'= 3(pa 2 -2b 2 ) ; B' = -12b(pa 2 -2b 2 ) ; 



O=~m* + 90paW-^pa*-15p 2 a* ; 



D' = b(l$0b*-±20pa 2 b 2 + ^ pa* + 90p 2 a*\ ; 



94-5 3^ 



E' = - 4346 6 4- 157 5pa 2 b*- ^paS 2 + 22 pa 6 



F' - 1008/j> 7 -5208/5a 2 6 5 + 3360/oW+ 1470/oa^ 3 



-630|oW-35/>a 6 6 ; 



14175 94-5 



G' = -2286b 8 +US76pa 2 b 6 -^^ paW + ^ pa% 2 



-~pa 8 - 15120pV6* + 5670/3V6 2 -^|oV. 



.... (22) 



The electrostatic force of the whole atom ABC upon the 

 near electron b is the same as (22) with the signs of the odd 

 powers of r reversed. The electrostatic force o£ the whole 

 atom ABC upon the positive charge of the other is given 

 by (21), for a on C or A on c, added to (21) with signs of 

 odd powers reversed for B on c, and added to —& 2 \kr 2 for 

 the force of C on c, giving 



F = ^{Cr- 4 + E?'- 6 + Gr- 8 4-l^- 10 ...}, . (23) 



atom ABC # 



on c. 



where the coefficients have the same values as in (21). 



Similarly, the force of the atom ABC upon the two 

 electrons of the other atom is found by adding to (22) the 

 same equation (22) with odd powers reversed, giving 



F = ^{AV^-fCV^ + EV-s + GV 10 ...}, (24) 



atom ABC & 



on (a + b). 



where the coefficients are the same as in (22). 



The whole electrostatic force of the atom ABC upon abc 

 is, therefore, the sum of (23) and (24), namely 



F = ~^(C + A>- 4 +(E + C>-H(G + E>- 8 



atom ABC "< ,— _. .- ,„ 



on atom abc. + (I + G') r~ 10 . . . }, 



