Abstract
On the basis of the previous reports of the other authors on the capillary-like patterns observed during the cultivations in vitro of fowl's leucocytes a reexamination was schemed. Result : Under the little modified conditions of cultivations it was true that the capillary-like patterns were formed within 24 hours from the beginning of cultivations, but thereafter the elongation of the patterns stopped and there remained only the pile of erythrocytes and leucocytes in the capillary tube, where the endothelial structures were no longer observed. The micro-scopic findings showed that these capillary-like patterns are of a degenerative sign of leucocytes, so that if only the cultivating conditions, which are mainly related to their physical properties in this case, were suitable enough, these patterns would be ever proliferating.
