Note 5 — Edited and annotated by Emma Helen Blair and James Alexander Robertson with historical introduction and additional notes by Edward Gaylord Bourne.

Alluding to the floods which, as often in former years, had recently inundated a part of the valley in which lies the City of Mexico. In 1627 heavy rains caused the bursting of the dams that confined the Quauhtitlan River, and parts of the city were overflowed. The same experience was repeated in 1629, but to such an extent that the entire city was under water, in most places more than five feet deep. It was more than four years before the city was freed from this calamity, and not until 1634 was this accomplished for the valley, by a series of earthquake shocks. See Bancroft’s account of these floods, and the drainage works undertaken to prevent them, in his Hist. Mexico, iii, pp. 7–11, 85–91.