Can it be maintained that this acceptation of _seven_ as a mystic number by nations so heterogeneous and living so far apart, and from the remotest ages, is purely accidental? The origin of its mystification has never been explained. It has been transmitted to us by our predecessors, who themselves had accepted it from theirs, without knowing why it was made the sacred number of the third degree in the rites of initiation into Freemasonry. True, in receiving the degree the initiated are told the esoteric meaning attached to it in modern times; but this meaning does not give the origin of its mystification. In fact, it is an invention of our days. That it was the sacred number of the highest degree of the sacred mysteries in Mayax is evident. We have seen that 3 was the number of the male children of king Can; 5 that of his sons and daughters; 7 was consequently that of the members of the whole family. It is not therefore improbable that to commemorate that fact, 7 was made the sacred number of the third degree of their sacred mysteries, and that this was the origin of its mystification. In these pages I have presented, without commentaries, a few of the facts that twelve years researches among the ruins of the antique temples and palaces of the Mayas, a knowledge of their language (still spoken by their descendants, and in some places, as in the vicinity of Peten, in all its pristine purity); the deciphering of certain mural inscriptions; the study of the sacred book of the Quiches, and the interpretation of passages in the Troano MS., have disclosed to me concerning the history, civilization, cosmogonical conceptions, religious tenets and practices of the ancient inhabitants of Yucatan.