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