**It** **accordingly** **comments** **on** **the** **Sphaerica** **of** **Theodosius**, **the** **Moving** **Sphere** **of** **Autolycus**, **Theodosius'****s** **book** **on** **Day** **and** **Night**, **the** **treatise** **of** **Aristarchus** **On** **the** **Size** **and** **Distances** **of** **the** **Sun** **and** **Moon**, **and** **Euclid'****s** **Optics** **and** **Phaenomena**.

**The** **most** **important** **are** :- **Euclid'****s** **Elements**; **Euclid'****s** **Data**; **Optical** **Lectures**, **read** **in** **the** **public** **school** **of** **Cambridge**; **Thirteen** **Geometrical** **Lectures**; **The** **Works** **of** **Archimedes**, **the** **Four** **Books** **of** **Apollonius'****s** **Conic** **Sections**, **and** **Theodosius'****s** **Spherics**, **explained** **in** **a** **New** **Method**; **A** **Lecture**, **in** **which** **Archimedes**' **Theorems** **of** **the** **Sphere** **and** **Cylinder** **are** **investigated** **and** **briefly** **demonstrated**; **Mathematical** **Lectures**, **read** **in** **the** **public** **schools** **of** **the** **university** **of** **Cambridge**.