From astronomy his attention is turned at once to Geography. He has to determine the exact longitude and latitude of a place, the name only of which is given, for he has to make his map of the heavens as seen from the place of birth. Here he gets a practical knowledge of localities and of the orientation of horoscopes. In his pursuit of Astrology the student will find himself tracking back through the biographies of great men and women in order to find data from which to test the various ascriptions of the astrologers. He will turn up cases of dementia and insanity in persons of repute and compare the data afforded by their horoscopes with the rules of Ptolemy, Morinus and Cardan. He will incidentally acquire a considerable knowledge of men and things which else had been to him an unwritten book. Further, testing the theory of eclipse influences he will inevitably find his way back to the ruined cities of Nineveh and Babylon and the three historical eclipses which preceded the downfall of the great Empire, which eclipses we have received from Hipparchus through the Syntaxis of Ptolemy. As to the latter there are the Greek, Latin and English editions of the work open to his study. The student will not proceed far before he comes up against the problem of Calendarics. He will find it impossible to understand and follow the works of the ancients without some notion of the equilization of Eras, and it will become imperative, if he would check the statements made in their works, as he should do, that he undertake the task of converting ancient into modern calendars. He may even find it necessary to know the names of the Assyrian, Egyptian, Greek, Indian and Chinese months. It is all involved in the process of his study. He will certainly require to know what are the Eras of the Hegira, the Salivahana, the Olympiads, and the Kali Yuga. Keen on the track of this ancient lore he may elect to study the primitive Chinese language, and the noble Sanskrit of India, the more perfectly to acquaint himself with the traditions of these peoples and to study their ancient presentment of the science of Astrology. He may conveniently follow up the record through the Greeks and Latins. Assuredly he will need to acquaint himself, at least superficially, with the anatomy of the human body, its physiology, pathology and hygiene. In the allocation of faculty to environment he will come into touch with sociology and will discriminate between the planetary occupations cited by Ptolemy and those that enter into the complex of modern life. In connection with the questions of marriage and progeny, the study of eugenics and gynecology will claim his attention. The study of character as revealed by the planetary dispositions at the moment of birth will bring him into touch with the profound and as yet only partially developed science of Psychology.