The Quaestiones contains notes from Newton's thorough reading of Descartes, Walter Charlton's translation of Gassendi into English, Galileo Galilei 's Dialogue Concerning the Two Chief World Systems, Robert Boyle, Thomas Hobbes, Kenelm Digby, Joseph Glanvill and Henry More, and others. These were set down under 45 section headings which he used to organize his readings. They began with the nature of matter, place, time and motion and went on to the organization of the universe. This was followed by what would be classed today as properties of condensed matter, for example, rarity, fluidity, hardness etc. These were followed by questions on violent motion, light, colour, vision, and other sensations. The last part contains miscellaneous topics which presumably occurred to him later during his readings: "Of God", "Of y Creation", "Of y soule" and "Of Sleepe and Dreams &c". Some headings were followed by vast entries, which had to be continued elsewhere; others were blank. The earlier essays were organized into questions and outlines of possible experiments which roughly fit into modern notions of science, not the broader ancient notion of philosophy.