183 ;;Quote: in philosophizing, do not support oneself upon the opinion of a celebrated author

183+;;Quote: philosophy is written in this grand book, the universe, which stands continually open to our gaze

183+;;Quote: philosophy is written in the language of mathematics, and its characters are triangles, circles, and other geometrical figures

211 ;;Quote: Galileo's perfection of the telescope from news that it was possible

297 ;;Quote: experience is primary over testimony; if others had seen the experiment, they would change their mind

309 ;;Quote: size, shape, place, adjacency, quantity, and speed are fundamental properties of material substance

309+;;Quote: tastes, odors, colors are mere names as far material objects are concerned; they are only excitations of living animals; same as tickling and armpits

311 ;;Quote: taste and smell determined by the size, shape, quantity, and speed of minute particles; either fall to the tongue or rise to the nose

311 ;;Quote: sound is the vibration of the air moving the cartilages of the tympanum; waves are rapidly propagated from trembling bodies; frequent waves have high pitch, rare waves low pitch

312 ;;Quote: motion is the cause of heat; fire is a multitude of minute particles, having a shape and velocity, that pentrate the body

326 ;;Quote: objects at all distances increase at the same ratio, whether seen through a telescope or not; e.g., consider rods at varying distances and sizes whose ends line up

347 ;;Quote: the head of a comet is like a conglobate nebula; its beard is an effluvium from the head, expelled through the rays of the sun; the tail represents the death of the head