ERKATA 



Page 62, seven lines from bottom, for C 12 read C 72 . 



" 64, nineteen lines from bottom, for K 3 Fe (CN) 6 read 

 K 4 Fe (ON), 



"' 65, eight lines lines from top, for TurnbuU's read 

 Prussian. 



" 137, eight lines from bottom, for while read whole. 



" 143, two lines from top, for expotential read exponential. 



