dwelt near his studio. In
this model (the measurements of which were in strict accordance with
those of the building itself, the difference being of size only), all
the difficult parts of the structure were shown as they were to be when
completed; as, for example, staircases lighted and dark, with every
other kind of light, with the buttresses and other inventions for giving
strength to the building, the doors, and even a portion of the gallery.
Lorenzo, having heard of this model, desired to see it, but Filippo
refusing, he became angry, and made preparations for constructing a
model of his own, that he might not appear to be receiving his salary
for nothing, but that he also might seem to count for something in the
matter. For these models Filippo received fifty lire and fifteen soldi,
as we find by an order in the book of Migliore di Tommaso, under date of
the 3d October, 1419, while Lorenzo was paid three hundred lire for the
labor and cost of his model, a difference occasioned by the partiality
and favor shown to him, rather than merited by any utility or benefit
secured to the building by the model which he had constructed.

"This vexatious state of things continued beneath the eyes of Filippo
until the year 1426,[3] the friends of Lorenzo calling him the inventor
of the work, equally with Filippo, and this caused so violent a
commotion in the mind of the latter, that he lived in the utmost
disquietude. Various improvements and new inventions were, besides,
presenting themselves to his thoughts, and he resolved to rid himself of
his colleague at all hazards, knowing of how little use he was to the
work. Filippo had already raised the walls of the cupola to the height
of twelve braccia in both vaults, but the works, whether in wood or
stone, that were to give strength to the fabric, had still to be
executed, and as this was a matter of difficulty, he determined to speak
with Lorenzo respecting it, that he might ascertain whether the latter
had taken it into consideration. But Lorenzo was so far from having
thought of this exigency, and so entirely unprepared for it, that he
replied by declaring that he would refer that to Filippo as the
inventor. The answer of Lorenzo pleased Filippo, who thought he here saw
the means of removing his colleague from the works, and of making it
manifest that he did not possess that degree of knowledge in the matter
that was attributed to him by his friends, and implied in the favor
w