Master Key System – Lesson 12
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Early 19th Century, scientists had observed that Uranus did not have the usual orbit that was expected based on their mathematical calculation. By 1845 Le Verrier, a teacher of astronomy at the Ecole Polytechnic Paris, had become interested in the motion of the planet Uranus. He set out to find out why and in the process discovered the present of another planet beyond Uranus. Hence Neptune was added to the Solar System. Inductive reasoning is the process of the objective mind by which we compare a number of separate instances with one another until we see the common factor that gives rise to them all.The essence of Lesson 11 lies in this.
Master Key System – Lesson 10
Master Key System Lesson 9
Perhaps this quotation from George Matthews Adams may sum up what is in this lesson 8 of The Master Key System:


