'I'll soon tell you!' replied Dick, and pulled his haversack round. From this he took out a small leathern case with a map tucked away in it. The map was a shilling section of the Ordnance Survey on the scale of one inch to a mile. Dick had bought it and carried it as patrol-leader. The space it covered--eighteen miles by twelve--was ample for their work. Dick knelt down and spread the map on the ground; Chippy knelt beside him. Chippy had never seen such a map before, and his keen intelligence was soon deeply interested. His finger began to run along roads he knew, and to point out spots he had often visited. 'Why, wi' this,' he declared, 'ye could go anywhere if ye'd never seed the place afore. Look here, this is the road to Lockin', an', I'm blest! why, 'ere's my gra'mother's house, this little black dot, just off o' the road. An' 'ere's the Beacon, an' there's the san'pit!' 'Yes, it's a jolly good map,' said Dick, 'and very clear in the heath part, for there are few roads and few houses, and every one is put in. Now, where are we? Let's find the rail and the station. That will give us our bearings.' The boys considered the map very carefully for a few moments; then Dick put his finger on a certain spot. 'That's just about where we are now,' he said, 'and I can prove it, I think.' 'I should just like to know 'ow ye do prove it,' said Chippy, to whom this map was a new and wonderful thing. 'Well,' said Dick, 'we know in a general way we're no very great distance from the Horseshoe, and here that is.' He placed his finger on the spot where the big redoubt was shown on the map. 'Then here's rising ground with trees on it, marked Woody Knap. Now, where's that?' 'Why, theer it is,' replied Chippy, pointing to a hill which rose above the heath at some distance. 'It must be that. There ain't no other hill wi' trees on it in all this part o' the h'eth.' 'And how far is it away from us?' ''Bout a mile.' 'Which way does it lie?' Chippy considered the sun, and thought over the directions Mr. Elliott had given the scouts time and again. 'Right away north,' he answered. 'Very well, then,' said Dick. 'We're a mile to the south. And a mile on the heath is an inch on the map. Now, my thumb-nail is just half an inch--I've measured it; so twice my thumb-nail to the south of Woody Knap brings us to the spot where we are.' 'So it does,' cried Chippy, with enthusiasm. 'It's as plain as plain now ye put it that way. An' that's a proper dodge, to measure it off wi' yer thumb-nail.' 'Oh, uncle gave me that tip,' laughed Dick. 'It's very useful for measuring short distances on the map. When you want a rule, you generally find you've left it at home, but your thumb-nail is always on the spot.' 'Yus,' smiled Chippy; 'ye mostly bring it wi' yer. Now,' he went on, 'wot's the distance to the Fort?'