History of the inductive sciences, from the earliest to the present time
CHAPTER IV.--INDUCTIVE EPOCH OF KEPLER.
_Sect._ 1. Intellectual Character of Kepler. 290 _Sect._ 2. Kepler's Discovery of his Third Law. 293 _Sect._ 3. Kepler's Discovery of his First and Second Laws. Elliptical Theory of the Planets. 296