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Link: • Carl Linnaeus to Kungliga Svenska Vetenskapsakademien, [31 December 1744] n.s.
Dated Undated but presumably written late in December 1744 or early in January 1745. Sent from ? () to ? (). Written in Swedish.


A review statement on a submitted observation suggesting that water in a pond has turned into blood. Linnaeus rejects the proposition.

There is a pond in the botanic garden in Uppsala in which the water every summer is turned into blood as observed many times by Samuel KlingenstiernaKlingenstierna, Samuel
(1698-1765). Swedish. Physicist and
mathematician, professor of experimental
physics at Uppsala. Correspondent of
and himself. The reason is, however, that large numbers of small, red worms, called monoculi, invade the pond.

It is already more than 70 years ago since Jan SwammerdamSwammerdam, Jan (1637-1680).
Dutch. Naturalist. By his microscopical
studies Swammerdam made fundamental
scientific contributions to the study of
entomology. Boerhaave edited his
Biblia naturae sive historia
, Martin ListerLister, Martin (1638-1712).
British. Naturalist.
and Steven BlankaartBlankaart, Steven (1650-1702).
Dutch. Anatomist and naturalist.
showed this

Linnaeus had mentioned this in his Academy lecture about the insects [Linnaeus refers to his Tal, om märkwärdigheter uti insecterneLinnaeus, Carl Tal, om
märkwärdigheter uti
insecterne, hållit för
wettenscaps academien uti auditorio
illustri, då första
praesidentskapet aflades 1739. d. 3.
(Stockholm, 1739). Soulsby
no. 1341.

It would have ridiculed the Royal Swedish Academy of Sciences [Kungliga Svenska VetenskapsakademienKungliga Svenska Vetenskapsakademien,
Swedish. The Royal Swedish
Academy of Sciences, Stockholm. Founded
in 1739.
] if the submitted observation had been accepted.


1. Bref och skrifvelser (1908), vol. I:2, p. 42-43   p.42  p.43.