| notes = Protest against conclusion of scientific committee (with D. I. Mendeleev as a chief) on spiritualism phenomena, signed by 130 persons. In Russian
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| notes = Protest against conclusion of scientific committee (with D. I. Mendeleev as a chief) on spiritualism phenomena, signed by 130 persons. In Russian, without a title. Published in ''St. Petersburg News'' (С.-Петербургскiя Вҍдомости).