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The lunar and planetary theories, the beautiful theory of Jupiter's satellites, the figure of the earth, and the tides, were mathematically treated by Maclaurin, D'Alembert, Legendre, Clairaut, Euler, Lagrange, Laplace, Walmsley, Bailly, Lalande, Delambre, Mayer, Hansen, Burchardt, Binet, Damoiseau, Plana, Poisson, Gauss, Bessel, Bouvard, Airy, Ivory, Delaunay, Le Verrier, Adams, and others of later date.
After dinner in the evening when it was very hot it was impossible to stay in the stifling yard, where the sun shone the whole afternoon. The only place in the house where it was possible to breathe was the rooms looking into the street, Euler and his son-in-law used sometimes to go and sit on the doorstep with Louisa.
"I begin," says Euler, "with considering an objection which almost all the Philosophical Systems have started against prayer. Religion prescribes this as our duty, with an assurance that God will hear and answer our vows and prayers, provided they are conformable to the precepts which He hath given us.
Gretchen's brother was the pastor of a little church just above them; I must not go without seeing him, Gretchen said. How could I? Euler was my classmate; together we labored for knowledge, and our first manly sympathies run in the same channel. On Sabbath I saw my friend in the pulpit.
Scarce here and there one will be able to make out your face; all your opinions will be out of date, your jokes obsolete, your puns rejected with fastidiousness as wit of the last age. Your way of mathematics has already given way to a new method which, after all, is, I believe, the old doctrine of Maclaurin new-vamped up with what he borrowed of the negative quantity of fluxions from Euler.
In the night they two Waidewuthis and the boy are lying by the fire, and Waidewuthis. occupies himself in kindling the boy's courage towards the idea of the godly-might of the Euler of a People. This address of Waidewuthis seemed to me quite masterly, quite perfect.
It was so long since old Euler had been alive, and he had been such a small thing then, that what was left of him now was very poor and rather ridiculous. Outside his former trade and his family life he knew nothing, and wished to know nothing. On every subject he had ideas ready-made, dating from his youth.
But our illustrious countryman, as well as Euler, whose solution appeared subsequently to that of D'Alembert, omitted all consideration of certain physical circumstances, which, however, did not seem to be of a nature to be neglected without examination. Laplace has supplied this deficiency.
Amalia, Euler, the girl, left off talking to take part in the discussion; and there were endless controversies as to whether there was too much salt in the stew or not enough; they called each other to witness, and, naturally, no two opinions were the same. Each despised his neighbor's taste, and thought only his own healthy and reasonable. They might have gone on arguing until the Last Judgment.
I look as if a curate had been taken out of me." Great men of science have for the most part been patient, laborious, cheerful-minded men. Such were Galileo, Descartes, Newton, and Laplace. Euler the mathematician, one of the greatest of natural philosophers, was a distinguished instance.
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