本卷收录了115篇文章，18世纪60年代，著名数学家欧拉应邀为德国公主函授哲学、物理学、宇宙学、化学、音乐等多个科学和艺术分支的知识。为此他写下了一系列文笔优美的文章，它们充分体现了欧拉渊博的知识、极高的文学修养和哲学修养。这些通信被整理成书并翻译成英文，分两卷出版。

This volume contains 115 articles. In the 1860s, the renowned mathematician Euler was invited to correspondence with German princesses on various branches of science and art, including philosophy, physics, cosmology, chemistry, and music. For this reason, he wrote a series of beautifully written articles that fully reflect Euler's profound knowledge, high literary and philosophical cultivation. These communications were compiled into books and translated into English, and published in two volumes.