sight; but the representation improves on closer study. It is evident that the process cannot be judged by a black-and-white example: the method should be used in making a plate which is to be printed in grey or buff. Since the parallel lines which are the base of the construction are drawn at a distance apart equal to the vertical interval on the scale ofthe map, e.g. at 1 mm. for roo-m. contour interval on a 1/100,000 map, it is clear that most topographical maps must be enlarged before a shading plate can be drawn by this method. It is clear also that the draughtsman must have some specimens to guide him in drawing his inclined contours among sinuous horizontal. The method requires study and experiment, which so interesting and novel an idea will certainly receive.]