Mungo Ponton died August 3rd, 1880. Though his discovery did little or nothing towards the development of photography proper, it is impossible to allow him to pass out of this world without honourable mention, for his discovery led to the creation and development of numerous and important photo-mechanical industries, which give employment to numbers of men and women. When Mungo Ponton announced his discovery in the _Edinburgh New Philosophical Journal_ in 1839, he probably never dreamt that it would be of any commercial value, or he might have secured rights and royalties on all the patent processes that grew out of it; for Poitevin's patent, 1855, Beauregard's, 1857, Pouncy's, 1858 and 1863, J. W. Swan's, 1864, Woodbury's, 1866, all the Autotype and Lambertype and kindred patents, as well as all the forms of Collotype printing, are based on Ponton's discovery. But so it is: the originator of anything seldom seeks any advantage beyond the honour attached to the making of a great invention or discovery. It is generally the petty improvers that rush to the Patent Office to secure rights and emoluments, regardless of the claims of the founders of their patented processes. On March 2nd, 1880, I delivered a lecture on "The Origin, Progress, and Practice of Photography" before the Lewisham and Blackheath Scientific Association, in which I reviewed the development of photography from its earliest inception up to date, exhibited examples, and gave demonstrations before a very attentive and apparently gratified audience. On the 27th May, 1880, Professor Alfred Swaine Taylor died at his residence, 15, St. James's Terrace, Regent's Park, in his seventy-fourth year. He was born on the 11th December, 1806, at Northfleet in Kent, and in 1823 he entered as a student the united hospitals of Guy's and St. Thomas's, and became the pupil of Sir Astley Cooper and Mr. Joseph Henry Green. His success as a student and eminence as a professor, lecturer, and author are too well-known to require any comment from me on those subjects, but it is not so generally known how much photography was indebted to him at the earliest period of its birth. In 1838 Dr. Taylor published his celebrated work, "The Elements of Medical Jurisprudence," and in 1840 he published a pamphlet "On the Art of Photogenic Drawing," in which he advocated the superiority of ammonia nitrate of silver over chloride of silver as a sensitiser, and hyposulphite of lime over hyposulphite of soda as a fixer, and the latter he advocated up to the year of his death, as the following letter will show:-- "_St. James's Terrace, February 10th, 1880._ "Mr. Werge.