Of minor matters which have been more or less talked about, there is the Library for the Working-Classes, just opened in the parish of St Martin-in-the-Fields--a praiseworthy example for other parishes, but not to be followed unless the readers actually exist, and manifest the sort of want which books alone can satisfy. A suggestion has been made, to use for books in hot climates, where paper is liable to rapid decay, the sheet-iron exhibited at Breslau, which is as thin and pliant as paper, and can be produced at the rate of more than 7000 feet to the hundredweight. This would be something new in the application of metal. Metallurgy generally is being further investigated by Leonhard of Heidelberg, who has just called on manufacturers to aid him in his researches, by sending him specimens of scoriae, particularly of those which are crystallised. Then there is Mr Hesketh's communication to the Institute of British Architects, 'On the Admission of Daylight into Buildings, particularly in the Narrow and Confined Localities of Towns;' in which, after shewing that the proportion of light admitted to buildings is generally inadequate to their cubical contents, and means for estimating the numerical value of that which really does enter, he states that the defect may be remedied by the use of reflectors, contrived so as to be 'neither obstructive nor unsightly.' He explains, that 'a single reflector may generally be placed on either the outside or inside of a window or skylight, so as to throw the light from the (perhaps small) portion of sky which remains unobscured overhead, to any part in which more light is required.' Such difficulties of position or construction as present themselves, 'may be overcome in almost every case, by, as it were, cutting up the single reflector into strips, and arranging them one above the other, either in the reveal of the window, or in some other part where it will not interfere with ventilation, or the action of the sashes.' This is adopting the principle on which improved lighthouse reflectors are constructed; and we are told, that 'the combinations may be arranged horizontally, vertically, or obliquely, according to the positions of the centre of the unobscured portion of sky, and of the part into which the light is to be thrown, and according to the shape of the opening in which the combination is to be placed.' As a case in point, it was mentioned that a reflector 'had been fitted to a vault (at the Depot Wharf, in the Borough) ninety-six feet in depth from front to back. The area into which the window opens is a semicircle, with a heavy iron-grating over it; and the result is, that small print can be easily read at the far end of the vault.' It is a fact worth knowing, that reflectors may be so constructed as to throw all the available daylight into any required direction; and in one instance the reflector may be made to serve at the same time as a dwarf venetian window-blind.