[The method of demonstrating phenoloxidase]

It is reported on the evidence of phenoloxidase containing cells (=POZ) under various experimental conditions in as well spleen and small gut of white rats as small gut and skin of rabbit. A modified technic is described which gives a shortened incubation time and a regulary pigmentation of the reactive cells. POZ are demonstrable between pH = 6.2 and 8.0.