I leave, and I carry my secret with me.

It will not be lost to humanity, but shall be entrusted to them when they have learned not to abuse it.
Farewell, Citizens of the United States!" Then the "Albatross" rose under the impulse of its mighty screws, and sped away amidst the hurrahs of the multitude.
I have ventured to remind my readers of this last scene somewhat in detail, because it seemed to reveal the state of mind of the remarkable personage who now stood before me.

Apparently he had not then been animated by sentiments hostile to humanity.

He was content to await the future; though his attitude undeniably revealed the immeasurable confidence which he had in his own genius, the immense pride which his almost superhuman powers had aroused within him.
It was not astonishing, moreover, that this haughtiness had little by little been aggravated to such a degree that he now presumed to enslave the entire world, as his public letter had suggested by its significant threats.

His vehement mind had with time been roused to such over-excitement that he might easily be driven into the most violent excesses.
As to what had happened in the years since the last departure of the "Albatross," I could only partly reconstruct this even with my present knowledge.