The Practica: Concerning The Great Philosopher's Stone Of The Ancient Sages is a book written by Valentinus, Basilius. This book is a comprehensive guide to the ancient alchemical art of creating the philosopher's stone, which was believed to hold the key to eternal life and the transmutation of base metals into gold. The author, Valentinus, Basilius, was a renowned alchemist and philosopher who lived during the 16th century. In this book, he shares...