"It will be observed that a line drawn out from the sun to the right will pass through Herschel, and if continued will intersect the new planet. It is very apparent that, when these three orbs occupy the position assigned them above, the influence of the unknown planet upon Herschel will be exercised in the highest degree, and consequently that Herschel will be drawn farther from the sun at that juncture than at any other; and if we know where _Herschel_ is, when this effect is produced, by prolonging the line through Herschel outward, it must pass through the new planet. The delicate observations upon Herschel gave this result, and showed when it was that it was swayed farthest from the sun. By taking the place occupied by the planet at that time, and increasing it onward one degree and a half per annum, we can point out the place it must occupy at any given period. In September last we find Leverrier communicating these results to his friends in Berlin. They are provided with charts, on which every observed star is mapped down; and if any new object presents itself in the heavens, it is immediately subjected to a rigid scrutiny. On the very night on which Leverrier's letter had been received, we find the telescope directed to the designated point in the heavens. A stranger appears, but has only the aspect of a fixed star. Long did the eye watch that night, but no motion was found. When twenty-four hours rolled round, and it was once more possible to fix the instrument upon this strange body, it had moved in the precise degree and direction computed. The new planet was found. The news spread with the utmost rapidity throughout the world,--all Europe was electrified, and soon the intelligence crossed the waters. Our telescope was directed to this object. All had hitherto failed,--no eye had ever seen it round and planet-like from its disk. The evening finally came round for the examination. Time moved on its leaden wings; but twilight faded away at length, and I took my seat, with my assistant, at the instrument. I directed the telescope to that point of the heavens. I found four stars in the field of view. The first was brought to the field of view of the instrument, and pronounced to be a fixed star; and so with the second. The third was brought forward; and before it had reached the centre of the field, I heard the exclamation, 'There it is!' and there it was, as bright and beautiful as Jupiter himself. Here was a result not attained by any other instrument in the world. When we know that a body is a planet, then, and not till then, do we find the disk. The great rival of our instrument had seen it, but did not recognise it.