Faraday to Mary Somerville   August 1834

Page 129. <cross> "it will produce one or both of these compounds mingled with the portion of oxygen or hydrogen in excess". Is not this kind of statement necessary if at least the uniting force be supposed equally active in all these cases? if it is not should it not be so stated?¹

Page 130. I have no right to object to the idea of the relative weights of pressures but I think the inference must be that the vapours of pressures differ altogether from the vapours & gases which we can recognise & examine for it is quite certain that the quantity by weight of any pressure mingled with air could not make it sensibly heavier or lighter; and that if the vapour pressure had the qualities of other vapours it could not separate from the air and sink through it &c.

p 131. "Or making it the positive pole of a pile in dilute acid (sulphuric)"

p 132 "or pass away as aqueous vapour"

p 142. "of the whole bulk when at 32°".

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for Mrs Somerville | with M. Faradays respects | Aug 1834