Among other things belonging to the Spanish period is the banner, with the picture of the Virgin, which accompanied the Spanish army during the Conquest. Authentic or not, it is certainly very well painted. There is a suit of armour said to have belonged to Cortes. Its genuineness has been doubted; but I think its extreme smallness seems to go towards proving that it is a true relic, for Bullock saw the tomb of Cortes opened some thirty years ago, and was surprised at the small proportions of his skeleton. Specimens of the pottery and glass now made in the country, and other curiosities, complete the catalogue of this interesting collection. The Mexican calendar is not in the Museum, but is built into the wall of the cathedral, in the Plaza Mayor. It is sculptured on the face of a single block of basalt, which weighs between twenty and thirty tons, and must have been transported thirty miles by Mexican labourers, for the stone is not found nearer than that distance from the city; and this transportation was, of course, managed by hand-labour alone, as there were no beasts of burden. We know pretty well the whole system of Mexican astronomy from this calendar-stone and a few manuscripts which still exist, and from the information given in the work of Gama the astronomer and other writers. The Aztecs and Tezcucans who used it, did not claim its invention as their own, but said they had received it from the Toltecs, their predecessors. The year consisted of 365 days, with an intercalation of 13 days for each cycle of 52 years, which brought it to the same length as the Julian year of 365 days 6 hours. The theory of Gama, that the intercalation was still more exact, namely, 12½ days instead of 13, seems to be erroneous. Our reckoning only became more exact than this when we adopted the Gregorian calendar in 1752, and the people marched about the streets in procession, crying “Give us back our eleven days!” Perhaps this is not quite a fair way of putting the case, however, for the new style would have been adopted in our country long before, had it not been a Romish institution. It was the deliberate opinion of the English, as of people in other Protestant countries, that it was much better to have the almanack a few days wrong than to adopt a Popish innovation. One often hears of the Papal Bull which settles the question of the earth’s standing still. The history of the Gregorian calendar is not a bad set-off against it on the other side. At any rate, the new style was not introduced anywhere until sixty or seventy years after the discovery of Mexico, and five hundred years after the introduction of the Toltec calendar in Mexico.