Last summer an archaeologist, Mr R. J. C. Atkinson, taking photographs at Stonehenge, made a most remarkable discovery. He was preparing to photograph a name carved on the inward-facing (northwest) face of Stone 53, one of the Great Horseshoe Trilithons; for this purpose he had remained there after 5 o’clock on July 10th, waiting for the sun to move round and shine on it. Looking not directly at the stone itself but at the image on the glass of his reflex camera, he suddenly saw the dark outline of what appeared to be a dagger, and beside it that of an axe. The carvings were deeply cut and the edges smoothened by the erosive action of more than thirty centuries of British weather (PLATE I). Closer inspection revealed several more axes and some other markings, all probably artificial but now too much weathered for decipherment. Two days later a ten-year-old schoolboy, David Booth, found an axe on the outer face of Stone 4, one of the stones of the Outer Circle, and subsequent search revealed ten more axes on the same face (PLATES II, VI A). Later still, while engaged in making casts of the axes already discovered, Mr R. S. Newall has found many more, bringing the total for Stone 53 up to 12 and for Stone 4 to 25, including on the latter one exceptionally large axe measuring 14 inches in length and 10½ inches across the splayed cutting edge. He has also verified three axes like the others near the bottom left-hand corner of the outer face of Stone 3 (PLATE III B).