§ XV. 2. The Parapet. Its forms are fixed in military architecture by the necessities of the art of war at the time of building, and are always beautiful wherever they have been really thus fixed; delightful in the variety of their setting, and in the quaint darkness of their shot-holes, and fantastic changes of elevation and outline. Nothing is more remarkable than the swiftly discerned difference between the masculine irregularity of such true battlements, and the formal pitifulness of those which are set on modern buildings to give them a military air,--as on the jail at Edinburgh. § XVI. Respecting the Parapet for mere safeguard upon buildings not military, there are just two fixed laws. It should be pierced, otherwise it is not recognised from below for a parapet at all, and it should not be in the form of a battlement, especially in church architecture. The most comfortable heading of a true parapet is a plain level on which the arm can be rested, and along which it can glide. Any jags or elevations are disagreeable; the latter, as interrupting the view and disturbing the eye, if they are higher than the arm, the former, as opening some aspect of danger if they are much lower; and the inconvenience, therefore, of the battlemented form, as well as the worse than absurdity, the bad feeling, of the appliance of a military feature to a church, ought long ago to have determined its rejection. Still (for the question of its picturesque value is here so closely connected with that of its practical use, that it is vain to endeavor to discuss it separately) there is a certain agreeableness in the way in which the jagged outline dovetails the shadow of the slated or leaded roof into the top of the wall, which may make the use of the battlement excusable where there is a difficulty in managing some unvaried line, and where the expense of a pierced parapet cannot be encountered: but remember always, that the value of the battlement consists in its letting shadow into the light of the wall, or _vice versâ_, when it comes against light sky, letting the light of the sky into the shade of the wall; but that the actual outline of the parapet itself, if the eye be arrested upon this, instead of upon the alternation of shadow, is as _ugly_ a succession of line as can by any possibility be invented. Therefore, the battlemented parapet may only be used where this alternation of shade is certain to be shown, under nearly all conditions of effect; and where the lines to be dealt with are on a scale which may admit battlements of bold and manly size. The idea that a battlement is an ornament anywhere, and that a miserable and diminutive imitation of castellated outline will always serve to fill up blanks and Gothicise unmanageable spaces, is one of the great idiocies of the present day. A battlement is in its origin a piece of wall large enough to cover a man's body, and however it may be decorated, or pierced, or finessed away into traceries, as