[Destruction in walled city.] Three years afterwards, the Duc d'Alencon (Lucon et Mindanao; Paris, 1870, S. 38) found the traces of the catastrophe everywhere. Three sides of the principal square of the city, in which formerly stood the government, or governor's, palace, the cathedral, and the townhouse, were lying like dust heaps overgrown with weeds. All the large public edifices were "temporarily" constructed of wood; but nobody then seemed to plan anything permanent. [Former heavy shocks.] Manila is very often subject to earthquakes; the most fatal occurred in 1601; in 1610 (Nov. 30); in 1645 (Nov. 30); in 1658 (Aug. 20); in 1675; in 1699; in 1796; in 1824; in 1852; and in 1863. In 1645, six hundred [12], or, according to some accounts, three thousand [13] persons perished, buried under the ruins of their houses. Their monastery, the church of the Augustinians, and that of the Jesuits, were the only public buildings which remained standing. [Frequent minor disturbances.] Smaller shocks, which suddenly set the hanging lamps swinging, occur very often and generally remain unnoticed. The houses are on this account generally of but one story, and the loose volcanic soil on which they are built may lessen the violence of the shock. Their heavy tiled roofs, however, appear very inappropriate under such circumstances. Earthquakes are also of frequent occurrence in the provinces, but they, as a rule, cause so little damage, owing to the houses being constructed of timber or bamboo, that they are never mentioned. [Scanty data available.] M. Alexis Perrey (Mém. de l'Académie de Dijon, 1860) has published a list, collected with much diligence from every accessible source, of the earthquakes which have visited the Philippines, and particularly Manila. But the accounts, even of the most important, are very scanty, and the dates of their occurrence very unreliable. Of the minor shocks, only a few are mentioned, those which were noticed by scientific observers accidentally present at the time. [The 1610 catastrophe.] Aduarte (I. 141) mentions a tremendous earthquake which occurred in 1610. I briefly quote his version of the details of the catastrophe, as I find them mentioned nowhere else.