18 Duke St. | 13 Nov 1837
My dear Sir
I enclose you two parcels of corrosive sublimate marked No 1 & No 21[.]
No 1 which has a bright crystalline appearance dissolves well & leaves no sediment, neither did it when in use appear to precipitate easily[.]
No 2 which has a flocculent appearance dissolves quicker at first but a considerable part is difficult of solution in our tanks it leaves a considerable deposit and the solution becomes less dense in a short time.
Will you have the goodness to inform me what are the real proportions of calomel2 or other impurities in each & whether you can account for these effects which I mention, by any difference which you discover in their analysis, or whether you think these results more likely to arise from some other causes which I have not observed, such which may have rendered the circumstances under which the two experiments have been made dissimilar3[.]
I am dear Sir | Yours very truly | I.K. Brunel
Dr. M. Faraday | Royal Institution
Please cite as “Faraday1047,” in Ɛpsilon: The Michael Faraday Collection accessed on