MODELS AND MAPS 149 



at least, of the map, in order to enable the eye to grasp the relief 

 more readily. A range of colours, from bluish-green in the hollows, 

 through yellow-green to yellow, orange, and red on the heights, 

 will be found a very satisfactory one. Bartholomew's half-inch 

 map might be shown as an illustration of the application of a 

 smaller colour range, but one which is very effective for walking 

 or bicycling maps. 





