From A. W. von Hofmann to Edward Cresy   27 October 1860

R. College of Chemistry

Oct. 27. 1860.

My dear Sir

I enclose you the book on poison from which my statement about arsenic was taken. Taylor explains his opinion so well that I need not add a word.1

I have made a few experiments with Iodine and find that 0.001 milligramme of iodine dissolved in 1 Gramme of water is scarcely indicated by the starch test,—but that 0.002 Milligrammes dissolved in 2 Grammes of Water is easily distinguished by that test.

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Hoping that this information will prove useful | Yours very truly | A W Hofmann

E. Cresy Esq

1
See letter from A. W. von Hofmann to Edward Cresy, 13 October 1860. CD had questioned the system of measurement used by Hofmann (letter to Edward Cresy, 14 October [1860]). Hofmann refers to Taylor 1848. Hofmann’s letter was sent to CD by Cresy enclosed with a letter of his own (see letter from Edward Cresy, 30 October 1860).

Please cite as “DCP-LETT-2966A,” in Ɛpsilon: The Charles Darwin Collection accessed on 5 June 2025, https://epsilon.ac.uk/view/dcp-data/letters/DCP-LETT-2966A