He finds that the equatorial region is the hottest; and that, as on our earth, the temperature diminishes towards the poles: it is in the central region that spots most frequently appear. The result of the investigations is that, after allowing for absorption, the heat which comes to the earth corresponds in amount to that inferred from photometric experiments, whereby the experiments made at Paris and at Rome confirm each other. Now that Mr Fox Talbot has so praiseworthily given up his patent right to Talbotypes, except in the matter of portraits, the art of photography will find itself stimulated to yet further developments; and with free practice, many new applications of it will be discovered. Magic-lantern slides, for instance, obtained from the negative image, are already lowered in price, while their style and finish are singularly beautiful. The architect of the bridge now being built over the Neva, at St Petersburg, is turning it to account in a very practical manner. Being an Englishman, he has had to endure much jealousy and misrepresentation, and attempts have been made to prejudice the authorities against him. To counteract these designs, he takes every week photographs of the work, which distinctly shew its progress, and these he sends to the emperor, who looks at them in a stereoscope of the largest size, and can thus satisfy himself of the actual condition of the bridge by means which malice or envy would not easily falsify. If the photograph shews finished arches, of what use will it be to deny their existence? People out of Russia may perhaps find it worth while to try the same experiment; and before long, a new order of 'detectives' on elevated stations, will be taking photographs of all that passes in the streets, and pickpockets _in delicto_ will find their offence and their likeness imprinted by one and the same process. With such a means of detection, and all the police stations connected by telegraphic wires, what are the thieves to do? Manchester shews itself earnest in the cause of education, by having established a Free Library of 16,000 volumes for reference, and 5000 for lending, and paid for it by voluntary subscription--L.800 of which was contributed by 20,000 of the working-classes. To their honour be it recorded! But the inhabitants have done yet more; they have made over the library to the town-council, that it may become one of their public institutions, and have agreed to pay a half-penny rate to provide the necessary funds for its perpetual maintenance. May they have their reward!