TREPHINING THE SKULL.
| 1. Scalpel. | 8. Quill, cut like a tooth-pick, to clear the groove of bone-dust. |
| 2. Trephines—several crowns. | 9. Lenticular knife. |
| 3. Hey’s saw. | 10. Small polypus forceps. |
| 4. Elevator. | 11. Sponges. |
| 5. Stout dissecting forceps. | 12. Lint. |
| 6. Brush to clean away the bone-dust. | 13. Ice. |
| 7. Probe. |