143

Logic 143

be desired and clinched the argument in the mind of every thinking person.
It will be observed that the argument was very different from what it would have been if Keppler had merely taken all the observations of longitude, lattitude and parallax and had constructed from them a theory that would suit them all.
That might evince no more than Keppler's extraordinary ingenuity.
Nor was the last test the same that it would have been if Keppler looking over the observations and hunting for features of them that should suit the theory had found this.
That might only show that out of many features of the onservations some suited the theory.
But his course was really different.
He did not select his test because it would give a favorable result.
He did not know that it would do so.
He selected it because it was the test which Reason demanded should be applied.
Let this course be pursued and no theories