Key to the Secrets of Nature

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See Ostroglazov Ivan Mikhailovich Ostroglazov (1838–1892) was a prominent Russian bibliographer and collector. He was particularly famous for his research into rare books and those suppressed by the state.

Book Rarities No. 144. This refers to the entry number in Ostroglazov’s major work, Knizhnye Redkosti (Book Rarities), published in 1891–1892. This catalog is a foundational text for identifying rare and banned Russian editions.

Banned book During the 18th and 19th centuries, the Russian Imperial government and the Church frequently banned or seized books deemed politically subversive or religiously heterodox.

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[Eckartshausen] Karl von Eckartshausen (1752–1803) was a German mystic whose works were immensely popular in Russia among Freemasons and spiritual seekers, though they were sometimes targeted by censors for their esoteric content.