It also contained what Savile saw as his own contributions to the subject, the most important of which he considered was his demonstration that Euclid, the author of the Elements, was distinct from Euclid of Megara .
Ito din na kung ano ang Savile nakakita bilang kanyang sariling kontribusyon sa subject, ang pinaka-mahalaga kung saan siya ay isinasaalang-alang ang kanyang pagpapahayag na Euclid, ang mga may-akda ng Sangkap, ay naiiba mula sa Euclid ng Megara.