are scientific, and trustful by nature, will have no difficulty in allowing for, and correcting my mistakes; but minds given to doubt will continue to doubt, and will be in doubt to the end of time, because doubt will not allow them to understand. As well as I can, remember, the Recorder said:—
"My son, I promised to describe to you the means by which we propel and control our aerial and naval fleets, and I think I mentioned something to you about lines of force. As I know you are not a mechanic, and as I know your scientific education is not even advanced for the age in which you lived, I have prepared some balls to represent our planet and our atmosphere at various distances from the earth's surface, and these I trust will assist you to comprehend my explanations. There was a philosopher in your day, or slightly prior to it, named Newton, who is reputed by history to have discovered the law of gravity. This man got much more credit for this alleged discovery than he deserved. The fact being
