**
11** | Solution of certain differential equations which do not admit separation of variables |

**75** | Solution of a problem proposed in the Nova Acta Eruditorum in November, 1743 |

**79** | A problem of geometry proposed publicly by an anonymous geometer |

**80** | Opuscula varii argumenti |

**84** | Observation by Leonhard Euler on sections 83 and following of the preceding book, concerning elastic curves |

**85** | Solution to a catoptric problem proposed in this journal in September 1745 on page 523 |

**100** | On Amicable Numbers |

**106** | Solution to the catoptric problem in Novis Actis Eruditorum Lipsiensibus proposed in November 1745 |

**119** | On vibrations of excited chords |

**121** | Physical conjectures on the propogation of sound and light with other dissertations: on amicable numbers, on natural equations, and on the rectification of ellipses |

**
156** | Opusculorum tomus III. continens novam theoriam magnetis ab illustr. academia regia scient: Parisina praemio condecoratam a. 1744. |

**211** | Problema, ad cuius solutionem geometrae invitantur; theorema, ad cuius demonstrationem geometrae invitantur |

**445** | Proof that every integer is the sum of four squares |