ERRATA in Volume xxxviii. {August 1894). 



Page 282, line 5 from bottom, for no electrification read comparatively little 

 electrification. 

 „ 234, „ 10 from top, for 6 x 10— s read 6 X 10— > 1 ; and for 4*8 per cent. 



read 4-8 X 10-8. 

 „ „ Delete first paragraph of § 14. 

 „ „ line 11 from bottom, for Even read But. 

 „ „ ,, 9 from bottom, for sufficient read insufficient. 



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