Errata in No. 75 (October 1881). 



Page 301. In the title of Mr. A. Gray's letter, for " Number of Electrostatic 

 Units in the Electromagnetic Unit of Electromotive Force," read " Number 

 of Electromagnetic Units in the Electrostatic Unit of Electromotive Force." 



Page 304, lines 9 to 13. In the values of E-tana given in the quotation from 

 Mr. Shida's report, insert the factor 10 9 . 



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