2024 Reprint of the 1934 Edition. Full facsimile of the original edition and not reproduced with Optical Recognition software. The is the first edition thus of Thomas Taylor's remarkable treatise on the Pythagorean's philosophy of numbers - with an added Introduction by Manly P. Hall. THOMAS TAYLOR, the author of this remarkable treatise on the philosophy of numbers, was one of the greatest Platonist of the modern world. He was a prodigy of erudition and industry. He translated into English the complete works of Plato and Aristotle and authored several original treatises as well. The Theoretic Arithmetic is the most important of his works. Throughout the book, Taylor draws on the writings of ancient Greek philosophers such as Plato and Aristotle to provide a comprehensive overview of Pythagoreanism and its influence on Western thought. This book is a valuable resource for anyone interested in the history of mathematics and philosophy, as well as those seeking to deepen their understanding of Pythagoreanism and its impact on modern thought.