image EL_L3_68_Fig
Image number: RS.15803
Credit: ©The Royal Society

Observations of the salt crystals in tobacco ashes


3 October 1704


Unknown, Artist

Object type

Archive reference number

Manuscript page number




height (page): 147mm
width (page): 98mm



12 figures in a letter by Antoni van Leeuwenhoek to John Chamberlayne. The verso side is covered in red chalk.

Fig. 1: three different salt particles as found in the ashes of tobacco after it having been put in rain water for 24 hours
Fig. 2: six-sided and flat particles of which he saw only a few
Fig. 3: a differently shaped salt particle as observed and drawn by the draftsman
Fig. 4: particles with sharp points
Fig. 5: regular four-sided particles with blunt corners
Fig. 6: six-sided particles
Fig. 7: equilateral particle with blunt corners
Fig. 8: a four-sided, oblong, block-shaped particle
Figs 9 and 10: he saw several particles shaped like the ones in figs 9 and 10
Fig. 11: but very few shaped like fig. 11
Fig. 12: he saw many like in fig. 12.

Object history

Printed in A. Leeuwenhoek, ‘Concerning tobacco ashes’, Phil. Trans. vol. 24, no. 293 (September and October 1704), pp. 1740-48, tab. 3, figs 1-12.

Related Fellows

Antoni van Leeuwenhoek (1632-1723, Dutch), Naturalist
John Chamberlayne (1661-1723, British), Author

Associated place

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