I have attempted to reduce these swellings by the administration of iodide of potassium, but have not met with any success. The only treatment appears to be the removal by operation. The method I adopt is as follows. The eyes being protected by a pad over each, an incision is made along the long axis of the tumor and the skin is freed on all sides so that its base is exposed. If the swelling is very small in a child it may be necessary to make a cross cut through the skin as well, in order to get sufficient room to work in. The bone being exposed, a portion of the swelling can easily be cut away by bone forceps, because it is very soft. If large, a few nicks with a Hey’s saw are found most useful in enabling a large portion of the mass to be removed entire. After as much has been removed as possible with the bone forceps, more may be got away by means of thegouge or the gouge forceps or the nibbling forceps. I have experienced difficulty in removing the deeper portions, particularly those close to the orbit. I need hardly say that in the latter the eye has to be carefully guarded from injury. After removal of the bone the wound is well washed out with an antiseptic lotion. The bleeding is slight and is easily controlled by pressure. The wound is closed by a continuous suture and it heals up readily.