Returning to consider the probable result of the gradual diffusion of star-cult owing to natural causes and of the consequent divergence from the idea of the Centre, which had so deeply influenced the minds of primitive men during many centuries, with earnest, and extended astronomical observation, keeping pace with the development of the idea of the Above and Below, it is obvious that the utmost attention would be next given to the conspicuous star groups and planets which are visible at certain times and then seem to have departed or descended into the under world. Any one who has read the interesting communications by Herr Richard Andree (Globus. bd. LXIV, nr. 22), On the relation of the Pleiades to the beginning of the year amongst primitive people, followed by a note by Herr Karl von den Steinen on the same subject, will realize that widely-separated tribes of men, by dint of simple observation, knew the exact length of the periodical appearance and disappearance of this star group and regulated their year accordingly. Herr Andree cites, for instance, that "in the Society islands, the year was divided into two portions, the first of which was named Matari-i-inia=the Pleiades above. It began and lasted during the time when these constellations were visible close to the horizon after sunset. The second period, named Matarii-i-raro=the Pleiades below, began and lasted for the time during which the star-group was invisible after sunset" (W. Ellis, Polynesian Researches, vol. II, p. 419, London 1829). That the ancient Mexicans had likewise observed the Pleiades and been deeply impressed by them is proven by the well-known fact that the ceremony of the kindling of the sacred fire, which betokened the commencement of a new cycle, was performed "when the Pleiades attained the zenith at midnight precisely." In my complete monograph in the ancient Mexican calendar-system it will be my endeavor to present all the data I have collected concerning the degree of elementary astronomical knowledge attained by the native astronomers. I shall, therefore, content myself with pointing out here that besides the foregoing testimony about the Pleiades, the native name for which was the miec=the many, or the tianquiztli=the marketplace, there are records proving that the cult of the planet Venus was a firmly established feature of the native religion at the time of the Conquest. Sahagun records that the Nahuatl names for this planet were citlalpul or hueycitlallin both signifying "the great star." "In the great temple of Mexico an edifice named ilhuicatitlan [literally, the land of the sky] consisted of a great, high column, on which the morning star was painted.... Captives were sacrificed in front of this column annually, at the period when the star re-appeared" (_op. cit._ appendix to book II).