Olduvai is one of the most important prehistoric sites in the world; indeed, the only Middle Pleistocene site of comparable importance is Choukoutien and Olduvai can show deposits far older. The site has produced a mass of material of the highest archaeological and palaeontology importance and in this first of five volumes Dr Leakey and his collaborators make their preliminary reports. The story of the excavations initiated by Dr Leakey in 1951 is...