a tray for identifying isolated microorganisms consisting of a plastic or glass tray body and a transparent cover , the body surface of which has two kinds of hollows for bacterial suspensions . one is formed horizontally across the surface of the tray and the other is composed of number of small wells long and slender , put parallel and rectangular to previous hollow . each of the small cells communicates over crest barrier to hollow put horizontally . with this tray , microorganisms can be exactly and easily identified .