In the actual condition of therapeutics, aseptic wounds generally heal in a few days. The more ambitious dreams of the surgeons of the pre-Listerian era have been fulfilled. Nevertheless, we have no right to believe that the treatment of wounds has reached its ultimate perfection. We must investigate whether or not it is possible to advance farther. In the treatment of wounds, we content ourselves by protecting the tissues against infection, and we leave to Nature the care of cicatrization. Would it not be feasible to act on the processes of reparation themselves and to activate them? The wounds which now heal in a few days could possibly be caused to heal in a few hours. The treatment of fractures would also be simplified. The development of methods for the stimulation of the growth of epithelial cells, for the inhibition or the activation of the proliferation of connective tissue, for