the _Chemist_, how many thousands must in some way or other have been made acquainted with the immense advantages it offers over all other processes in the arts, and how many instances could be adduced in testimony of its usefulness? For instance, its value to the Government during the last war, in the engineering department, the construction of field works, and in recording observations of historical and scientific interest. Your committee noticed that an attractive feature of the Photographic Society's last exhibition was a series of drawings and plans, executed by the Royal Engineers, in reduction of various ordnance maps, at a saving estimated at £30,000 to the country. The non-commissioned officers of this corps are now trained in this art, and sent to different foreign stations, so that in a few years there will be a network of photographic stations spread over the world, and having their results recorded in the War Department, and, in a short time, all the world will be brought under the subjugation of art. "Mr. Warren De la Rue exhibited to the Astronomical Society, November, 1857, photographs of the moon and Jupiter, taken by the collodion process in five seconds, of which the Astronomer-Royal said, 'that a step of very great importance had been made, and that, either as regards the self-delineation of clusters of stars, nebulæ, and planets, or the self-registration of observations, it is impossible at present to estimate the value.' When admiring the magnificent photographic prints which are now to be seen in almost every part of the civilized world, an involuntary sense of gratitude towards the discoverer of the collodion process must be experienced, and it cannot but be felt how much the world is indebted to Mr. Archer for having placed at its command the means by which such beautiful objects are presented. How many thousands amongst those who owe their means of subsistence to this process must have experienced such a feeling of gratitude? It is upon such considerations that the public have been, and still are, invited to assist in securing for the orphan children of the late Mr. Archer some fitting appreciation of the service which he rendered to science, art, his country--nay, to the whole world. "M. Digby Wyatt, _Chairman_, "Jabez Hogg, _Secretary to Committee_. "_Society of Arts, July, 1858._"