As a monument of mathematical genius applied to the celestial revolutions, the Mecanique celeste ranks second only to the Principia of Newton.
Kepler divined its possibility; but his thoughts, derailed (so to speak) by the false analogy of magnetism, brought him no farther than to the .rough draft of the scheme of vortices expounded in detail by Rene Descartes in his Principia Philosophiae (1644).
Up to the time of the publication of the Principia in 1687 the method of fluxions which had been invented by Newton, and had been of great assistance to him in his mathematical investigations, was still, except to Newton and his friends, a secret.
Clarke has been generally supposed to have derived the opinion that time and space are attributes of an infinite immaterial and spiritual being from the Scholium Generale, first published in the second edition of Newton's Principia (1714).
In 1644 the third great work of Descartes, the Principia philosophiae, appeared at Amsterdam.
He took orders in 1713; and the same year, at the request of Dr Richard Bentley, he published the second edition of Newton's Principia with an original preface.
The more important of his works are: Judaeus christianizans - circa principia fidei et SS.
As aids to the study of logic, the doctors of this period, beside the commentaries and treatises of Boetius (q.v.), possessed two tracts attributed to St Augustine, the first of which, Principia dialecticae, is probably his, but is mainly grammatical in its import.
In the same letter Halley found it necessary to inform Newton of Hooke's conduct when the manuscript of the Principia was presented to the Society.
In 1674, at the age of eighty-six, he published his Principia et problemata aliquot geometrica, ante desperata nunc breviter explicate et demonstrate (L.