Letter, 'Second letter on the electrolysis of secondary compounds' by J [John] Frederic Daniell to Michael Faraday Subject: Physics Published in Philosophical Transactions as 'Second letter on the electrolysis of secondary compounds. Addressed to Michael Faraday, Esq. D. C. L. F. R. S., Fullerian Prof. Chem. Royal Institution, &c. &c. &c. By J . Frederic Daniell, Esq. F. R. S. For. Sec. R. S., Prof. Chem. in King's College, London'. Written by Daniell at King's College [London]. Received by the Royal Society on 30 April 1840. Read 21 May 1840. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 4, 1843. 29 April 1840