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As to memory, it is known that this frail faculty naturally lets drop the facts which are less flattering to our self-love when it does not retain them carefully as subjects not to be approached, marshy spots with a warning flag over them. But it is always interesting to bring forward eminent names, such as Patricius or Scaliger, Euler or Lagrange, Bopp or Humboldt.
The same subject was again proposed for a prize which was shared by Lagrange and Euler, neither finding a solution, while the latter asserted the existence of a resisting medium in space. Again, in 1774, the Academy submitted the same subject, a third time, for the prize; and again Lagrange failed to detect a cause in gravitation. Laplace now took the matter in hand.
Here again, the profoundest researches of Clairaut, Euler, D'Alembert, and La Place, were brought practically to bear on navigation. Guided and aided by these, Tobias Mayer, of Gottingen, compiled a set of solar and lunar tables, which were sent to the lords of the admiralty, in the year 1755; they gave the longitude of the moon within thirty seconds. They were afterwards improved by Dr.
But, when the cart had driven away, as night fell, leaving the furniture heaped up in the room; and Christophe and Louisa were sitting, worn out, one on a box, the other on a sack; they heard a little dry cough on the staircase; there was a knock at the door. Old Euler came in.
The labors of Kepler were mathematical, optical, cosmographical, and astronomical, but chiefly astronomical. His whole published works comprise some thirty or forty volumes, while twenty folio volumes of manuscript lie in the Library at St. Petersburg. These Euler, Lexell, and Kraft undertook some years ago to examine and publish, but the result of this examination has never appeared.
Nevertheless this great theory of undulation, like many another truth, which in the long run has proved a blessing to humanity, had to establish, by hot conflict, its right to existence. Illustrious names were arrayed against it. It had been enunciated by Hooke, it had been expounded and applied by Huyghens, it had been defended by Euler. But they made no impression.
Let us compare the orchestral pitch of the eighteenth with that of the nineteenth century. As the peoples of Europe became more passionate and agitated in public and in private life, and as our whole intellectual life rose to a higher level, our orchestral tone was keyed up higher. In 1739 Euler reckoned the vibrations of the great eight-foot C to be one hundred and eighteen to the second.
She said that she was not to be lectured fey a rapscallion, and in her own house, too! And she treated him with abuse. The others came running up on the noise of the quarrel, except Vogel, who fled from anything that might upset, his health. Old Euler was called to witness by the indignant Amalia and sternly bade Christophe in future to refrain from speaking to or visiting them.
But, generally, their conversation branched out into philosophical subjects; and father and son argued with so much fervour, that the fond mother's interference became necessary, the immortal names of Leibnitz, Newton, and Euler ringing with a clarion-like peal that boded ill for the repose of the younger members of the family.
And the same thing is recorded of that great scholar of Holland, Hugo Grotius. The mathematician Euler could repeat the Aeneid of Virgil from beginning to end, containing nearly nine thousand lines. Mozart, upon hearing the Miserere of Allegri played in the Sistine Chapel at Rome, only once, went to his hotel, and wrote it all down from memory, note for note.
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