According to Clavigero, II. 162, the 30th of May
1521, on which day
Cortes dated the commencement of this memorable siege.—E.
 Corpus Christi fell that year, according to Clavigero,
on the 30th May,
so that the occupation of Iztapalapa, by which the investment of
Mexico was completed, was on the 3d of June.
 The whole of this topographical account of Mexico
and its approaches
is added by the editor, and has been placed in the text, distinguished
by inverted commas, as too long for a note. A plan is added,
constructed from a comparison of the maps in Diaz and Clavigero, both
evidently drawn without any actual survey, and corrected by means of
the excellent map of the vale of Mexico given by Humboldt. By means of
a great drain, made considerably posterior to the conquest, the lake
has been greatly diminished in magnitude, insomuch that the city is
now above three miles from the lake; so that the accurate map of
Humboldt does not now serve for the ancient topography of Mexico and
its near environs.—E.
 It is hard to guess which way the brigantines
could get there, as by
the maps both of Diaz and Clavigero, the great double causeway of
Xoloc or Iztapalapa, ought to have completely prevented his
penetrating to that part of the lake. It was probably Xoloc against
which this attack was made, and Diaz may have mistaken the name after
an interval of fifty-one years; for so long intervened between the
siege of Mexico in 1521, and 1572, when he informs us his history was
 Perhaps along the mound or causeway of Mexicaltzinco;
by which he
approached towards the great causeway of Xoloc, and the position of De
Oli at Cojohuacan.—E.
 Though not mentioned by Diaz, this necessarily
implies that one of the
bridges of each causeway must have been taken possession of by the
Spaniards, to allow the brigantines to get through into those parts of
the lake which were intersected by the causeways.—E.
 Though not especially mentioned by Diaz, it appears
that Cortes had
taken the immediate command of the detachment of De Oli, at Cojohuacan,
which formed the southern attack.—E.