Errata in No. 98 (August 1883). 
Page 147, lines 28, 29, for and, on account of disturbances, neglected, 
read and on account of disturbances neglected, 
— 152, at foot, for 1= -jj- 9 read 1= ^ g. 
— 156, instead of the equations 
q =AI = &c. 
q' = AT= Sec. 
read AI B „ 
where R is tbe total resistance in circuit ; 
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