320 Scientific Intelligence. 
paper by means of potash’ water-glass to which a little oxide at . 
- lead was added. A pile of 7,000 of the lead plates one square 
: centimeter in section could be ¢ harged so as to exhibit strong 
polarization. A certain septs: of moisture must be commun 
cated to ie piles. The sup aoe of lead cs Ae a electro: 
inciple of sagt or 
nnalen, 1883, — 1 PP. 
