‘This map’, the Director General informs us in his Foreword, ‘forms the northern portion of the Map of Britain in the Dark Ages, of which the southern portion was published in 1935’. It represents therefore the completion of a task which must have taken nearly a decade to carry out, from its first inception down to publication. This northern sheet is in fact a map of Early Scotland, showing it as it was roughly between the years A.D. 450 and 850; but in this dim historical dawn exact dates cannot as a rule be discerned. A long historical introduction of 26 pages, and 5 diagrams, serve to amplify and elucidate the map itself; and there is of course the usual index of place-names.