In former experiments it could be shown, that new bone is formed around ashwood after implantation in the tibia of rabbits, in spite of a foreign-body tissue reaction. Equally prepared ashwood half-cylinders were now implanted in the soft tissue of rats and evaluated 2, 6, 12 and 30 weeks after implantation. Around the implants a foreign-body tissue reaction developed and demonstrates the hitherto insufficient preparation of the implants.