PROFESSOR KELLAND, ON MOLECULAR EQUILIBRIUM. 47 



of which the last factor 



= /(-^cos20 + C) 



= fa dp (1 - cos 2<p) = irdp sin 2 <p 



= "\P- J i^y d P} 



+ 2(a 2 - P)(a + I - R) 



+ <* + %-* }]: 



consequently the whole attraction is 



AM ^ V " fdRe- aR \(a + l-R)R--^ («T7 a~^T . a + l-R) 



-^ (a*-P)(a + l-R)R- {a+ ^: :R3 R} 

 2a i v ' v ; 12a 



-\ 



\a 2 ) 



a* + l* m R> 

 R + 



2« s " ' 12< 



AMP 4,**e-« R ((a*-ly 2 . 7W . . 72X (\+aR\ 



« +/ : /i? 2 2R 2\ 1 /jR 4 41F 12R* 24 J? 24\1 



