Draft letter, from Sir John Herschel to Michael Faraday, dated at Slough Draft letter. Hears that the Board of Longitude is to be dissolved; it will therefore be necessary to seek a new source of income for the continuance of the Optical Glass experiments. Will be guided by Michael Faraday's wish whether to continue the experiments. Charles Anderson has showed him curious experiments with the fusion of Fluor with clay. 21 July 1828