The first book will deal with the Ethnology and Civil History of the different races which occupied Scotland. In this inquiry, it will be of advantage that we should start with a clear conception of the knowledge which the Romans had of the northern part of the island, and of the exact amount of information as to its state and population which their possession of the southern part of it as a province affords. This will involve a repetition of the oft-told tale of the Roman occupation of Scotland. But this part of the history has been so overloaded with the uncritical use of authorities, the too ready reception of questionable or forged documents, and the injurious but baseless speculations of antiquaries, that we have nearly lost sight of what the contemporary authorities really tell us. Their statements are, no doubt, meagre, and may appear to afford an insufficient foundation for the deductions drawn from them, but they are precise; and it will be found that though they may compress the account of a campaign or a transaction into a few words, yet they had an accurate knowledge of the transactions, the result of which they wished to indicate, and knew well what they were writing about. It will be necessary, therefore, carefully to weigh these short but precise statements, and to place before the reader the state of the early inhabitants of Scotland as the Romans at the time knew them and viewed them, not as what by argument from other premises they can be made to appear.[18] This will lay the groundwork for an inquiry into their race and language; and an attempt will then be made to trace the history of these different races, their mutual struggle for supremacy, the causes and true character of that revolution which laid the foundation of the Scottish monarchy, and the gradual combination of its various heterogeneous elements into one united kingdom; and thus by a more complete and critical use of its materials, to place the early history of the country, during the Celtic period, upon a sounder basis.