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记载第八世纪时发现氧气问题的书籍《平龙认》,自克拉普罗特以后的一百七十年来,不论中国和外国都没有人看到过。克拉普罗特是德国人,论文写于十九世纪开始,宣读和发表的地点是当时俄罗斯的彼得堡,发表时用的文字是法文,论述的却是中国八世纪的事。本文注意了克拉普罗特时代的历史背景和化学水平,探讨了克拉普罗特所介绍的《平龙认》成书年代,认为八世纪虽是炼丹术和医药学发达的时代,是唐帝国由盛而衰的转折点,但在历史上并没有具体的“至德元年三月初九”,即该书成书的这一天,加之其他疑点,提出了《平龙认》可能是一本伪书。
The book “Pinglong Cognizance” which recorded the oxygen problem in the 8th century has not been seen in China and foreign countries since the lapse of the 170 years since Kraproth. Kraptrot was a German. The essay was written in the 19th century. The place where it was read and published was Petersburg in Russia at the time. The text was published in French, but it was the eighth century in China. This article pays attention to the historical background and chemical level of the Kraprot era, discusses the writing time of the “Ping Long Cognizance” introduced by Kramprot, and believes that although the eighth century was a time when alchemy and medicine were developed, it was the Tang Empire and The turning point of decline, but in the history there was no specific “March to March of the First Year of March,” that is, the day the book was written, together with other doubts, the “Ping Long Cognizance” may be a pseudo-book.