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