p 



p. 10 

 p. 13 

 p. 13 

 p. 17 

 p. 18 

 p. 28 

 p. 29 

 p. 41 



p. 42 



p. 42 

 p. 43 



p. 47 

 p. 48 



p. 48 



p. 54 

 p. 61 

 p. 62 

 p. 65 



p. 70 

 p. 73 

 p. 73 



ERRATA. 



Art. I. 



line 24, insert "closed circuit" before "type," and delete 



"treated in this section." 



line 22, read "E^/D'" for "Ej/Di." 



read "Cos(S + <^)" for "Cos(^ + <^)." 



read "6'^" for "^^." 



read "§14" for "§ 15." 



read "Cos<^" for "CosP." 



and 3, read "P and POosc^^' for " P., and F.^oscfi." 



read "^" for "</>." 



7, insert "a" after "of." 



read "mutually" for "naturally." 



/>, />, 



read " A_j + y^" for " /;, + jjy" 



read "§ 47" for "§ 45." 



read "j^V' ^or ":c^." 

 read " ///O./" for " //,C./." 

 read "y^f^i" for "//'.j." 



1 



-/?.:' 



P - I „ ^ /' - 



read " — ■■ — A for " — r 

 I ^ I 



read "jcV' f*^'' "a^V" 



read "§ 34" for "§ 33." 



insert reference number (V). 



after "in" insert "Section II. and in." 



read "e " for " e 

 read " P/' for " P." 

 delete " that." 



,8." 



