Chemistry and Physics. - 263 
also able to act at a distance, will probably aid greatly in the develop- 
ment of the nature of physical force generally: and if (as I believe) 
the dualities are essential to the forces, are always equal and equivalent 
0) e 
metallic vessel, charge it strongly by contact with the machine or a 
eyden jar, and then dip the insulated ball into it; and after touching 
the bottom of the vessel with the ball, remove it, without touching the 
sides: it will be found absolutely free from eharge, whatever Ils pre- 
vious state may have been; for none but a single state can exist at the 
tom of such a metallic vessel; anda single state, 7. é., in an vicki 
lated duality, cannot exist alone. 
Possible one of these, and separating it in any degree from the other, 
: e been made. Thus six equal electro-mag- — 
alike in polarity, might i bical space and produce an experi-— 
ght inclose a cubical spa 
mental chamber. When excited, these magnets were very aarp 
'n the outer direction, as was found by nails, filings, spirals, an niet 
= but within the chamber, walled in on every side by intense nort 
Poles, th j 
F : the chat 
pedinary magnetic poles of like nature produced corres 
Single pole presented its usual character, attracting iron, | 
