KNOWI.l nc.l".." Volitnic XX.W (I9IJ). 



Plate III. to face paiie 20. 







*A«^1?<<^==^ 



FiGL'KE iv. 



FlC.l'KK V, 



I'lGLKE viii. 



Harmon. >gr:ipli liacin.L;:^ which have boon recorded Electrolytici 



