respective theorists answered the attack, although in what manner we have been unable to discover.
In 1699, Keill published a rejoinder, entitled "An Examination of the Reflections on the Theory of the Earth, together with a defence of the Remarks on Mr Whiston's New Theory." The Defence of the Theory appears by no means to have infused into Keill a greater spirit of politeness. He proceeds with the impatience of a man of sense and knowledge interrupted, terminating with an advice to Burnet to study "numbers and magnitude, astronomy and statics; that," he continues, "he may be the better able to understand the force of my arguments against his Theory, after which I doubt not but that he will easily perceive its errors, and have the ingenuity to acknowledge them. But till then, all farther disputation between him and me must needs be vain and frivolous, since true reasoning on natural philosophy depends on such principles as are demonstrated in those sciences, the knowledge of which he has not yet attained."[1] To his other opponent, Whiston, Keill has in this work, probably owing to the manner in which he was answered, forgot his former courtesy, treating him with no more deference than he has used toward Burnet.
In 1700, Dr Thomas Millington, Sedelian professor of natural philosophy in Oxford, on his appointment as physician in ordinary to the king, substituted Keill as his assistant, to read his public lectures; and the term for enjoying the Scottish exhibition at Baliol college then expiring, he accepted an invitation from Dr Aldrich, dean of Christ's church, to reside there. As his master Gregory was the first who introduced the Newtonian philosophy to the universities, Keill himself possesses the reputation of having been the first to demonstrate its principles on experiment; a task he is said to have performed through machinery of his own invention, but of what description, or to what extent he proceeded in his proofs, we are not informed.
In 1701, Keill published his "Introductio ad Veram Physicam," a useful and popular treatise on the Newtonian Philosophy. It is considered as an excellent introduction to Sir Isaac Newton's Principia, and has frequently been reprinted in England, and in a French translation. About the year 1708, Keill was chosen a fellow of the Royal Society, and after his admission he published in the Philosophical Transactions a pretty lengthy paper, " in which the laws of attraction, and other principles of physic are shown."[2] At this period, the scientific world became disturbed by the dispute which had assumed the aspect of a national question, whether Leibnitz formed his idea of the doctrine of fluxions from some unpublished discoveries of Sir Isaac Newton, and which of these two great men could properly be considered the inventor of that sublime addition to the power of the human intellect. In the Acta Eruditorum published at Leipsic, it was maintained that Leibnitz was the sole inventor, all right on the part of Newton being denied. To this Keill answered in a paper which he communicated to the Royal Society, defending his friend without much regard to the accusations which he brought against his opponent
In 1711, Leibnitz complained to the Royal Society, that Keill had accused him of obtaining and publishing his knowledge in a manner not reputable to a philosopher, or even exactly consistent with honesty; he appealed to Sir Isaac himself as a witness of his integrity, and required that Keill should publicly disavow the offensive construction which might be applicable to his words. The Royal Society being appealed to as philosophical judges in the matter, appointed a committee to examine the papers and documents connected with the dispute,
