. In a recent test a quarter incb bar of steel did not break till 8,332 pounds were put upon it, but a bar of iron of the same diameter bore 4,504 pounds only. The Swedish inventor of a new method of preserving milk in the form of a powder claims that it retuins all its good qualities, does not turu sour and can be kept in cans like vegetables. A pieee of skin cut from a human body will show signs of life for ten days a f ter separation. This disco very is important in connection with the grafting of new skiu over a damaged part of the body. Hitherto Tyndall's theory that the azure tint of the sky is due to minute corpuscles in the air has been accepted. Professor Springer of Liege has proved that the blue of the sky is purely electrical in origin and is au essential quality of the air.