IV CONTENTS. 



Centrifugal revolution ; theories connected therewith. Pythagoreans ; philo- 

 sophy of Measure and of Harmony. Commencement of a mathematical treat- 

 ment of physical phsenomena. Order and government of the Universe as 

 presented in the writings of Aristotle. Impartation of motion considered as 

 the groundwork of all phsenomena ; the tendency of the Aristotelian school 

 being less directed towards considerations of diversities of substance. The 

 natural philosophy of this school descended, both in its fundamental ideas and 

 in its form, to the Middle Ages. Roger Bacon ; the Mirror of Nature of 

 Vicentius of Beauvais : Liber Cosmographicus of Albertus Magnus ; and the 

 Irnago Mundi of Cardinal Pierre d'Ailly. Advances in philosophy by Gior- 

 dano Bruno and Telesio. Remarkable description, by Copernicus, of gravita- 

 tion as mass-attraction. First attempts at a mathematical application of the 

 doctrine of gravitation by Kepler. Descartes' work on the Coemos, or his 

 " Traite du Monde," a grand undertaking ; but fragments only were 

 published, and that long after his death. The Kosmotheoros of Huygens 

 unworthy of his great name. Newton and his Philosophise Naturalis Prin- 

 cipia Mathematica. Tendencies towards the recognition of Nature as a whole. 

 Is any solution possible of the problem of reducing to a single principle the 

 whole doctrine or comprehension of Nature, from the laws of gravitation to 

 the formative activities in organic and animated bodies? "What is perceived 

 is far from exhausting what is perceivable. The essential impossibility of a 

 perfectly complete experimental knowledge of all natural facts renders the 

 problem of explaining the variable in matter from the powers of matter an 

 " indeterminate one." 



A. URANOLOGICAL PORTION of the Physical Description of the 

 Universe, p. 26 457, and ix. clvi. Division into two 

 parts, one of which treats of Astrognosy, or the heaven of 

 the fixed stars, and the other comprises our Solar System . 26 27 

 Notes ix. 



a Astrognosy (heaven of the fixed stars), p. 27 258, or p. 2729 

 Notes, p. ix. xcii. 



Section I. Cosmical space, and conjectures respecting what 

 . appears to occupy the intervals between the heavenly 



bodies . ."" . . . . . . 3042 



Notes ix. xiv. 



