Note 6 — PREFACE

It appears by the printed works of this author, that he was named Didacus Placidus de Titis. He was a native of Bologna, by profession a monk, and was styled Mathematician to the Archduke Leopold William of Austria. He wrote in the earlier part of the 17th century, and his work, now cited, is considered to contain the most successful application of Ptolemy’s astrological rules to practice. The original is extremely scarce; but a new English edition, by Cooper, may be had of the Publishers of this work.