modulating and supplying to said second electrode an electrode signal obtained from {HEAD ~ a signal generating means} in {TAIL ~ the second liquid container}, 
in
modulating and supplying to said second electrode an electrode signal obtained from { HEAD ~ a signal generating means } in { TAIL ~ the second liquid container } ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH