The method involves the application of focused acoustic energy to each of {TAIL ~ a plurality} of fluid containing reservoirs to eject a small fluid droplet on the order of 1 picoliter or less from each reservoir to a site on {HEAD ~ a porous substrate surface} 
The method involves the application of focused acoustic energy to each of { TAIL ~ a plurality } of fluid containing reservoirs to eject a small fluid droplet on the order of 1 picoliter or less from each reservoir to a site on { HEAD ~ a porous substrate surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD