The various labors of a crowd of specialists are needed to give completeness to our knowledge of primitive man, and it is scarcely necessary to say that there are a hun dred questions which in such a short book as this have been left untouched. The intention has been to present these features which can best be combined to form a con timaeus panorama, and also to avoid, as far as possible, the subjects most under controversy. No apology surely is needed for the joint character of the work: as in every chapter the conclusions of many different and sometimes contradictory writers had to be examined and compared, and as these chapters, few as they are, spread over various special fields of inquiry.