To this no answer is made, but that it was built for coaches; and if it had been built for carts, it would have been made stronger:  thus all the controvertists agree, that the bridge is too weak for carts; and it is of little importance, whether carts are prohibited, because the bridge is weak, or whether the architect, knowing that carts were prohibited, voluntarily constructed a weak bridge.  The instability of the elliptical arch has been sufficiently proved by argument, and Ammanuti’s attempt has proved it by example.

The iron rail, whether gilt or varnished, appears to me unworthy of debate.  I suppose every judicious eye will discern it to be minute and trifling, equally unfit to make a part of a great design, whatever be its colour.  I shall only observe how little the writer understands his own positions, when he recommends it to be cast in whole pieces from pier to pier.  That iron forged is stronger than iron cast, every smith can inform him; and if it be cast in large pieces, the fracture of a single bar must be repaired by a new piece.

The abrupt rise, which is feared from firm circular arches, may be easily prevented, by a little extension of the abutment at each end, which will take away the objection, and add almost nothing to the expense.

The whole of the argument in favour of Mr. M——­, is only, that there is an elliptical bridge at Florence, and an iron balustrade at Rome; the bridge is owned to be weak, and the iron balustrade we consider as mean, and are loath that our own country should unite two follies in a publick work.

The architrave of Perrault, which has been pompously produced, bears nothing but its entablature; and is so far from owing its support to the artful section of the stone, that it is held together by cramps of iron; to which I am afraid Mr. M——­ must have recourse, if he persists in his ellipsis, or, to use the words of his vindicator, forms his arch of four segments of circles drawn from four different centres.

That Mr. M——­ obtained the prize of the architecture at Rome, a few months ago, is willingly confessed; nor do his opponents doubt that he obtained it by deserving it.  May he continue to obtain whatever he deserves; but let it not be presumed that a prize granted at Rome, implies an irresistible degree of skill.  The competition is only between boys, and the prize, given to excite laudable industry, not to reward consummate excellence.  Nor will the suffrage of the Romans much advance any name among those who know, what no man of science will deny, that architecture has, for some time, degenerated at Rome to the lowest state, and that the pantheon is now deformed by petty decorations.

I am, Sir, yours, &c.
[1] Mr. Milne.

LETTER III.

Sir, Dec. 15,1759.

It is the common fate of erroneous positions, that they are betrayed by defence, and obscured by explanation; that their authors deviate from the main question into incidental disquisitions, and raise a mist where they should let in light.