— 231 —

warm the tube by hand, so as to bring out thc piece of ice,it, upon melting, will give you pure water,

not a tracc of sulphuric acid remaining in it. The same wasthe case with common sah Solution, Sul. Soda, Alcohol, etcetc, and if I remembcr rightly, even with some solid Compoundsof water. I think Irecollect the brcaking up of crystals of Sulphateof Soda by cold, and I should like very much now to try theeffect of a carbonic acid bath on crystals of Sulphate of copper.So it strikcs nie that in thc effect of the cold on the colourlessdahlia Solution, the reappcarance of the colour may depend uponthc Separation of the Sulphurous acid from the solidifying water.

Your nine conclusions in the letter you last sent me arevery strong and will startle a good many, but if thc truth iswith them, I should not mind the amazement they will pro-duce nor necd you mind it either; but the chemist, of whichbody I do not count myself one now a days, will want strongproof and be slow to convince. — As to the electrical mattersI referred to, I expect you havc received by post a printedaccount of what I there referred to.

I think some of my letters must havc missed; you scoldme so hard. As I cannot remember what I have scnt or said,I am obliged to enter in a rcmembrance the letters written orreceived and looking to it find the account thus: 1 1852 Dcc r 8.S. to F. 2 — Dcc. 9. F. to S. 3 — Dcc. 29. S. to F. 4 - ■ 1853

1 Faraday, in enumerating these letters apparently gives the dates on whichhe received them from Schcenbein, so that the dates at first sight do not seemto correspond with Schcenbeins.

2 Missing: unless we assume that he received the October 17. letter aslate as December. In his letter to Schcenbein of December 9 he at all eventsspeaks of it as Schcenbeins last letter. 3 vide p. 207. 4 vide p. 210.

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