One of the most interesting details of the Institution still remains to be mentioned. It is the repository. The measures necessary for forming it have not been neglected, but from its nature it cannot be finished, nor indeed can it be begun, till the establishment is quite complete in all its other essential parts. Models of mechanical inventions and contrivances, in order to their being really useful, must be so made as to serve for imitation; consequently they must be constructed with the greatest care, and they cannot be made in the workshops of the Royal Institution till those shops are fitted up and furnished with the best tools and the best workmen. These workshops will soon be completed and properly manned. In the meantime a spacious and elegant room, 44 feet long and 32 feet wide, with the ceiling supported by two rows of columns, has been built for the repository, and will be finished in a month and ready to receive machines for public inspection. [This was the room beneath the theatre.] It may be useful to observe here that it never was the intention of the managers, nor of any of them, to expose to public view models of machines of all kinds indiscriminately. Considerable alarms have, it is said, been occasioned among some of our principal manufacturers from an idea that the construction of their machines and the valuable secrets of their trade, on which the excellence of their manufactures depend, are in danger of being disclosed by means of the public lectures and exhibitions of the Royal Institution, but the event will show that these apprehensions are without foundation. The measure lately adopted by the managers for completing the attic story will be finished before the end of November.