ERRATA. 



Section A. 



Page 27, line 3 from bottom, read 



f jnia- r) 



2b \ 



, 31, „ 8 from bottom, /or ^ = <^:^'» = 



31. 



bottom line, /or " [ eI^^^ drdv'\ read " "• 



4 TT^ 4 7r2/2 



, 34, line 9 from top, /or - . — ", read - . ". 



ir^ ol" ir~ 8 



39, 10 from top, read " The law of distribution of charge will be 

 determined as in problem C ". 



, 40, 7 from top, /or a; = ^ " read " n = — ". 



, 40, bottom line, should read — J^t-^ r^r"- 



, 44, line 3 from bottom,/or 4:BynR' YQ[n R')nH " rea^^ " 4BynEYo{nIt')/n'^r\ 



, 45, lines 2, 4, 6, 7 from top, for ^" " ^ ". 



«r «3 



^ e-inB ^ -J-JwB 



, 45, line 3 from bottom, for - 47^2/ " read " - 47^2, — 7- ". 



, 51, 5 from top, /or ^'•^^-^^R''^ read ~27~^^"* 



, 51, in bottom line prefix " The latter''. 



, 60, line 3 from top, for ^ " read ^ 

 a a 



, 62, ,, 10 from bottom, /or " ^ (a^r) " re«f? " ^ (am«) "• 



, 64, ,, 4 from bottom, /or re««^ " n", making corresponding correction 



throughout to end. 



