A clever writer in the Builder wants experiments to be
tried in the manufacture, or rather the production of, diamonds. He has a notion that diamonds might be made by the " subjection of carbon along with sulphide of carbon to galvanic action, in order to see whether the so galvanized sulphide would not dissolve an additional dose of the carbon, which might then be crystallized in its precipitation, on the gradual diminution and withdrawal of the galvanic action," and wishes chemists to try it. We wish they would try something a little more practical, and that is the pro- duction of a glass which shall be fusible, colourless, but capable of colour, but when cold as unbreakable as sapphire. That would be almost an invaluable contribution to architects' resources.