John Dalton's lectures and lecture illustrations.

  • Gee, W. W. Haldane.
Date:
[1915]
Catalogue details

Licence: In copyright

Credit: John Dalton's lectures and lecture illustrations. Source: Wellcome Collection.

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    above as similarly constituted, but with six vegetable atoms. Sheets 25 to 28 seem to belong to the same period and were found together, apart from all the other sheets described here. Sheet 29. Formulae equivalent to C HO (acetic acid, or “vegetable atom ”) and C4H303, the latter being a central carbon atom surrounded by three “ vegetable atoms.” This may represent one of the acids above mentioned, or possibly the atom of sugar, or of wood. Dalton represented sugar on various occasions as a central carbon atom with 5? 8, and 12 “ vegetable atoms” around it. Sheet 30. Formula, entitled “indigo.” Equivalent to CsH,ON. In his paper on the “ Nature and Properties of Indigo” (Mem., 1824, 9, 427) Dalton arrived at this composition from Crum’s analysis, with Dalton’s own atomic weights. Sheet 31. Formula, entitled “ oil etc.” and described : Gay I.ussac. “Carb. 777 77’2 “ Olive oil and probably Oxv. 9'2 9 4 Spermaceti oil.” Hyd. 13-1 13-4 ” “ Constitution 1 atom Carbonic oxide. 10 atoms olefiant gas.” This constitution is found in the Laboratory Note¬ book iv., p. 58 (1811). Earlier suggested formulae are to to found, but are different from that of this sheet. Sheet 32. The atoms C3H2ON arranged as a molecule. Below is written in Dalton’s handwriting: