The principal objection to these slides is, that a hard line of separation between the slide and the landscape beneath, is, in many cases, unavoidable. For example, the slide is quite unobjectionable in Mr. Repton's Plate I., which is our Fig. 1, above given (and also our Figs. 4 and 5), because the line of the top of the paling is hard in itself, as appears in our Fig. 4; but the upper slide in Mr. Repton's Plate II. (represented by our Fig. 6), produces a hard and conspicuous outline, from the difficulty of cutting off the paper close to the outline of the group of trees in the centre of the picture. At the same time, if slight sketches be employed instead of finished drawings, this objection has much less force; and in ground plans, as we have already observed, the invention is of real value.