contrary it must stand apart like that of the Cathedral and of San
Giovanni at Florence, and of the Cathedral at Pisa, where the
campanile is quite detached as well as the dome. Thus each can
display its own perfection. If however you wish to join it to the
church, make the lantern serve for the campanile as in the church at
Chiaravalle.

[Footnote: This text is written by the side of the plan given on Pl.
XCI. No. 2.]

[Footnote 12: The Abbey of Chiaravalle, a few miles from Milan, has
a central tower on the intersection of the cross in the style of
that of the Certosa of Pavia, but the style is mediaeval (A. D.
1330). Leonardo seems here to mean, that in a building, in which the
circular form is strongly conspicuous, the campanile must either be
separated, or rise from the centre of the building and therefore
take the form of a lantern.]

755.

It never looks well to see the roofs of a church; they should rather
be flat and the water should run off by gutters made in the frieze.

[Footnote: This text is to the left of the domed church reproduced
on Pl. LXXXVII, No. 2.]

_B. The theory of Dome Architecture.

This subject has been more extensively treated by Leonardo in
drawings than in writing. Still we may fairly assume that it was his