A pregnant Shetland pony mare with a compound comminuted fracture of the left metatarsus was admitted to the clinic on March 22, 1953. An x-ray of the leg showed that there were about one hundred fragments of bone in the area of the fracture. The leg had been fractured the previous day. The mare was treated with 1500 units of tetanus antitoxin and 1,500,000 units of penicillin.