Errata in No. 55 (March 1880). 

 Page 193, art. 5, line 12, after frame insert from 



— 196, art 11, line 3, for 319 read 313 



— „ „ line 9, move all the figures one place to the left. 



— 197, line 2, after that insert after the first stage, and for collecting read 



unaccented 



Errata in No. 56 (April 1880). 

 Page 271, line 37 for V kn N read Uj^n 



— 271, — 38, for Vkn is not read U& w n is not 



— 271, — 41, /or U^=45rea^Ui rt N=45 



— 272, — 7, for observations read vibrations 



— 282, — 31, for curve read error. 



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