A remarkable compilation of out-takes, in colour, showing small-scale penicillin production/harvesting in a laboratory of an unknown origin. There is a single unidentified male laboratory assistant and most of the shots are cropped so he is not seen. Later in 'Plant No. 1' there is a female laboratory assistant. The action of the centrifuge is pointed out with a wooded pointer. Eventually a brownish powder is produced which is tipped out from a bottle - this is presumably penicillin.