IV. ST. MARK’S 99

will be easily discernible: These I shall state in their natural order.

§ 30. LAW I. That the plinths and cornices used for binding the armour are to be light and delicate. A certain thickness, at least two or three inches, must be required in the covering pieces (even when composed of the strongest stone, and set on the least exposed parts), in order to prevent the chance of fracture, and to allow for the wear of time. And the weight of this armour must not be trusted to cement; the pieces must not be merely glued to the rough brick surface, but connected with the mass which they protect by binding cornices and string courses; and with each other, so as to secure mutual support, aided by the rivetings, but by no means dependent upon them. And, for the full honesty and straightforwardness of the work, it is necessary that these string courses and binding plinths should not be of such proportions as would fit them for taking any important part in the hard work of the inner structure, or render them liable to be mistaken for the great cornices and plinths already explained as essential parts of the best solid building. They must be delicate, slight, and visibly incapable of severer work than that assigned to them.

§ 31. LAW II. Science of inner structure is to be abandoned. As the body of the structure is confessedly of inferior, and comparatively incoherent materials, it would be absurd to attempt in it any expression of the higher refinements of construction. It will be enough that by its mass we are assured of its sufficiency and strength; and there is the less reason for endeavouring to diminish the extent of its surface by delicacy of adjustment, because on the breadth of that surface we are to depend for the better display of the colour, which is to be the chief source of our pleasure in the building. The main body of the work, therefore, will be composed of solid walls and massive piers; and whatever expression of finer structural science we may require, will be thrown either into subordinate portions of it, or entirely directed to the support of the external mail, where in arches

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