the reader will take a magnifying glass to the figure 6 _d_, he will
see that its square ornaments, of which, in the real door, each contains
a rose, diminish to the apex of the arch; a very interesting and
characteristic circumstance, showing the subtle feeling of the Gothic
builders. They must needs diminish the ornamentation, in order to
sympathize with the delicacy of the point of the arch. The magnifying
glass will also show the Bondumieri shield in No. 7 _d_, and the Leze
shield in No. 7 _e_, both introduced on the keystones in the grand early
manner. The mouldings of these various doors will be noticed under the
head Archivolt.

[Illustration: Plate VI.
BYZANTINE JAMBS.]

Now, throughout the city we find a number of doors resembling the square
doors of St. Mark, and occurring with rare exceptions either in
buildings of the Byzantine period, or imbedded in restored houses;
never, in a single instance, forming a connected portion of any late
building; and they therefore furnish a most important piece of evidence,
wherever they are part of the original structure of a _Gothic_ building,
that such building is one of the advanced guards of the Gothic school,
and belongs to its earliest period.

On Plate VI., opposite, are assembled all the important examples I could
find in Venice of these mouldings. The reader will see at a glance their
peculiar character, and unmistakable likeness to each other. The
following are the references:

1. Door in Calle Mocenigo.
2. Angle of tomb of Dogaressa Vital Michele.
3. Door in Sotto Portico, St. Apollonia (near Ponte di
Canonica).
4. Door in Calle della Verona (another like it is close by).
5. Angle of tomb of Doge Marino Morosini.
6, 7. Door in Calle Mocenigo.
8. Door in Campo S. Margherita.
Plate VI. 9. Door at Traghetto San Samuele, on south side of Grand
Vol. III. Canal.
10. Door at Ponte St. Toma.
11. Great door of Church of Servi.
12. In Calle della Chiesa, Campo San Filippo e Giacomo.
13. Door of house in Calle di Rimedio (Vol. II.).
14. Door in Fondaco de' Turchi.
15. Door in Fondamenta Malcanton, near Campo S. Margherita.
16. Door in south side of Canna Reggio.
17, 18. Doors in Sotto Portico dei Squellini.

The principal points to be noted in these mould