WE have received from the Ordnance Survey the Aberdeen sheet of the International Map of the Roman Empire on the scale of 1 to 1,000,000. The sheet covers the greater part of Scotland north of the Firth of Forth. Heights are shown by layer colours of two tints of green and three of brown. Spot heights in metres give actual altitudes; there are no contour lines. Modern names are confined to those of water features, and they are printed in blue. Roman features and place-names, which are of course few on this sheet, appear in black. Tribes are named in red. Forts, temporary camps and signal stations are differentiated. There is only one Roman road. Scales and index to adjoining sheets appear in the margin. The sheet is a beautifully clear piece of colour printing.