Disclosed is a novel reagent for blood cell counting and a novel blood analysis method, which enable blood cells such as leukocytes to be counted with high accuracy by dissociating platelet aggregates in capillary blood collected from a living body. The elastic cord draws the percussion woodblock and the vibration absorbing material together into a flexibly fixed position so that the instrument is playable. Printed electronic processes are utilized to produce the indicator andor the piezoelectric charge generator. The apparatus further includes a supplementary electrode and a supplementary virtual electrode. A silicon dioxide-comprising material is chemical vapor deposited over the rapid thermal processed dielectric material to fill remaining volume of said at least some peripheral isolation trenches. A planar motion device is also described for crawling over a planar surface.