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William Jory Henwood, Esq., was balloted for, and duly elected into the Society.

The reading of a paper entitled, " On the Chemical Action of the Rays of the Solar Spectrum on Preparations of Silver and other Substances, both metallic and non-metalHc ; and on some Photo- graphic processes ; " by Sir John F. W. Herschel, Bart., V.P.R.S., &c., was resumed but not concluded.

The President stated to the Meeting, that, accompanied by the Treasurer, Secretary, and other Members of the Council, he had, on Tuesday last, presented the Address to His Royal Highness Prince Albert, to which His Royal Highness returned the following gracious answer :

" It has been the source of great pleasure to me that my arrival in this country should have been hailed with such flattering demon- strations of sincere affection. Amongst the many that have reached me, none have given me more satisfaction than that which I have just received from the Council of the Royal Society."

Captain John Theophilus Boileau was balloted for, and duly elected into the Society.

The reading of a paper entitled, On the Chemical Action of the Rays of the Solar Spectrum on Preparations of Silver and other Substances, both metallic and non-metallic ; and on some Photo- graphic Processes;" by Sir John F. W. Herschel, Bart., V.P.R.S., &c., was resumed and concluded.

The object which the author has in view in this memoir is to place