It is Morgan's great merit that he has discovered and reconstructed in its main lines this prehistoric basis of our written history, and that in the kinship groups of the North American Indians he has found the key to the most important and hitherto insoluble riddles of earliest Greek, Roman and German history. His book is not the work of a day. For nearly forty years he wrestled with his material, until he was completely master of it. But that also makes his book one of the few epoch-making works of our time.
In the following presentation, the reader will in general easily distinguish what comes from Morgan and what I have added. In the historical sections on Greece and Rome I have not confined myself to Morgan's evidence, but have added what was available to me. The sections on the Celts and the Germans are in the main my work; Morgan had to rely here almost entirely on secondary sources, and for German conditions - apart from Tacitus - on the worthless and liberalistic falsifications of Mr. Freeman. The treatment of the economic aspects, which in Morgan's book was sufficient for his purpose but quite inadequate for mine, has been done afresh by myself. And, finally, I am, of course, responsible for all the conclusions drawn, in so far as Morgan is not expressly cited.