Specimens: Currant bush and seeds
Early in his career, Leeuwenhoek used currant seeds as a unit of measurement.
- 1673 August 15 (Letter 2) to Henry Oldenburg
- 1677 October 5 (Letter 33 [21]) to Henry Oldenburg
Later, he several times mentioned currant bushes among groups of similar trees and bushes, especially when he discussed the lice (aphids) that grew on such plants.
- 1685 October 12 (Letter 88 [47]) to Anthonie Heinsius: currant seeds
- 1692 April 22 (Letter 120 [72]) to Richard Waller: currant seeds
- 1695 May 1 (Letter 143 [88]) to Anthonie Heinsius: currant buds
- 1695 July 10 (Letter 147 [90]) to Frederik Adriaan van Reede van Renswoude: currant bush and its insects
- 1716 November 17 (Letter 329 [XXX]) to Gottfried Leibniz: currant seeds, why so many.
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