B = B, cEx 
— B- Bz cEy 
Fat (—) B, — Bz cEz 
—cE; — cE, —1cE 
B — B, — E‚/c 
— Bz B. — E,/e 
a) B, —B — E-/e 
E‚/c E‚/e E./c 
The equations for the field are (14.41) 
0 0 
3 (6) —- (Vg Fe’) = DB) (Ng Pet + Vg Me), 
dx? Ox? 
and we have, if P is the principal di-electric polarization : 
[Pw]. — [Pw], Pz 
=, P Zz ) 
Vege eS [Pw] [Pw] Py (18.1) 
Dee A «el Ds 
and 
em-+k-+[n.w]. —cem,—k,—[n.w]y na 
VaMe(=) —Cm-— k-—[n.w]- emz+k+[0.W |x Hy (18.2) 
em,+k,+|0.W], —cemg—ky—[n.W Ja: Nz 
— 0x — Il, Th 
where n denotes the (electric) polarization of moving magnetism. 
For the conjugate tensor of the field we have 
EEN B,/c 
— E‚ E B,/c 
NE ; a 
—B,/e —B/e — B,/c 
We see that the equations (14.42) amount to 
crotE + B=0, (18.31) 
div B= 0, (18.32) 
From the equations of the field we see that 
div E = — div (P + n), (18.41) 
and 
erot B —E = rot (om + k + |n.w] + [P.w]) + [P +n]. (18.42) 
These are the equations we have met in §10. Only we had not 
yet separated p= P-+ Dd there. 
