unsatisfactory, no one ever attempted to employ it either commercially or scientifically. In publishing his first process, with its working details, Daguerre appears to have surrendered all that he knew, and to have been incapable of carrying his discovery to a higher degree of advancement. Without Mr. Goddard's bromine accelerator and M. Fizeau's chloride of gold fixer and invigorator, the Daguerreotype would never have been either a commercial success or a permanent production. 1840 was almost as important a period in the annals of photography as the year of its enunciation, and to the two valuable improvements and one interesting importation, the Daguerreotype process was indebted for its success all over the world; and photography, even as it is practised now, is probably indebted for its present state of advancement to Mr. John Frederick Goddard, who applied bromine, as an accelerator, to the Daguerreotype process this year. In the early part of the Daguerreotype period it was so insensitive there was very little prospect of being able to take portraits with it through a lens. To meet this difficulty Mr. Wolcott, an American optician, constructed a reflecting camera and brought it to London. It was an ingenious contrivance, but did not fully answer the expectations of the inventor. It certainly did not require such a long exposure with this camera as when the rays from the image or sitter passed through a lens; but, as the sensitised plate was placed _between_ the sitter and the reflector, the picture was necessarily small, and neither very sharp nor satisfactory. This was a mechanical contrivance to shorten the time of exposure, which partially succeeded, but it was chemistry, and not mechanics, that effected the desirable result. Both Mr. Goddard and M. Antoine F. J. Claudet, of London, employed chlorine as a means of increasing the sensitiveness of the iodised silver plate, but it was not sufficiently accelerative to meet the requirements of the Daguerreotype process. Subsequently Mr. Goddard discovered that the vapour of bromine, added to that of iodine, imparted an extraordinary degree of sensitiveness to the prepared plate, and reduced the time of sitting from minutes to seconds. The addition of the fumes of bromine to those of iodine formed a compound of bromo-iodide of silver on the surface of the Daguerreotype plate, and not only increased the sensitiveness, but added to the strength and beauty of the resulting picture, and M. Fizeau's method of precipitating a film of gold over the whole surface of the plate still further increased the brilliancy of the picture and ensured its permanency. I have many Daguerreotypes in my possession now that were made over forty years ago, and they are as brilliant and perfect as they were on the day they were taken. I fear no one can say the same for any of Fox Talbot's early prints, or even more recent examples of silver printing.