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Updated: June 20, 2025


There was no opposition to the reappointment of Leverrier to his old place. In fact, at the time of my visit, Delaunay said that President Thiers was on terms of intimate friendship with the former director, and he thought it not at all unlikely that the latter would succeed in being restored. He kept the position with general approval till his death in 1877.

I think his manners were about equal to -'s, as occasionally he yelled and was told to be quiet. "About ten o'clock M. Leverrier asked me to go into the observatory, which connects with the dwelling. They are building immense additional rooms, and are having a great telescope, twenty-seven feet in focal length, constructed.

Then the English astronomers remembered that they too held in their hands the means for making this wonderful discovery, but, by having allowed so much time to elapse, they had let the honour go to France. However, the names of Adams and Leverrier will always be coupled together as the discoverers of the new planet, which was called Neptune.

And when I say "nothing" I postulate something of which we have no experience. And yet we cannot say that a thing does not exist till it is known to exist. The planet Neptune existed though, qua us, it did not exist before Adams and Leverrier discovered it, and we cannot hold that its continued non-existence to my laundress and her husband makes it any the less an entity.

When the astronomer, Leverrier, found that the planets Saturn and Uranus did not come to time, he asked himself how that could be.

Continually are amateurs in astronomy sending notes of new discoveries to Bond, or some other astronomers, which are no discoveries at all! "Astronomers have long supposed the existence of a planet inferior to Mercury; and M. Leverrier has, by mathematical calculation, demonstrated that such a planet exists.

In recent times the institution has been marked by an energy and a progressiveness that go far to atone for its former deficiencies. The successors of Leverrier have known where to draw the line between routine, on the one side, and initiative on the part of the assistants, on the other.

Fourthly, M. Leverrier's reasons for believing that the planet exists are based on the supposition that astronomical observations are more precise than they really are. Probably, Liais's objections would have had more weight with Leverrier had the fourth point been omitted.

All the world honors the bright genius and mathematical skill of John Couch Adams, and recognizes that he first solved the problem by calculation. All the world, too, perceives clearly the no less eminent mathematical talents of M. Leverrier, but it recognizes in him something more than the mere mathematician the man of energy, decision, and character.

There happened to be no star chart of this kind for the particular part of the sky wanted, and thus a long time elapsed and the planet was not identified. Meantime a young Frenchman named Leverrier had also taken up the same investigation, and, without knowing anything of Adams' work, had come to the same conclusion.

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