With precise and complete tables for calculating nativities. The author was unaware of another volume which treats this subject in a systematic, connected, exhaustive, lucid and above all, correct, form. Since Ptolemy's time, the errors and inaccuracies met with in modern astrological calculations have been allowed to grow and thrive, only to vitiate judgments based upon them. The author did his best to purge the mathematical portion of the subject, of almost all blunders more or less of which are found in almost every existing book on this subject.