Errata in No. V. of the Contributions to Terrestrial Magnetism, Art. X. 
Page 148, line 2 (Equation 4), 
for ■ , cos $' read cos 9'. 
J A! A' cp 
Page 148, line 10 (Equation 11), 
for •/ (cos %+ a tan 0) 2 + h* sin 2 £ tan 0' read \f (cos £ + a tan 0) 2 + 6 2 sin 2 £ . tan 0 
Page 149, line 14 (Equation 16), 
for 
H,„ + H, 
2 v/H, 11, 
read 
Ha, + H e 
2 v'Ha H s 
