The use of adherent plastics for reinforcement of the walls of intracranial aneurysms was first suggested by one of us (B.S.), and the technique developed and reported by Selverstone and Ronis (1958).1 Since that time, the method has been used clinically for treatment of aneurysms of the circle of Willis and its branches by Selverstone in 15 cases, and, experimentally, in 5 cases for reinforcement in the course of surgery of the great vessels by Callow, Rheinlander,2 and Deterling at the New England Center Hospital. This report describes certain preliminary studies which were undertaken before clinical use, and further experimental studies which have been done with a view to the wider application of the technique in arterial surgery. The uses at present contemplated for the technique include the reinforcement of aneurysms which are unsuitable for resection; the reinforcement of junctions after arterial suture, or auto-, homo-, or allograft,