Shortly after Petroleum came into use as light its cheapness suggested the employment of it as a means for raising steam, especially on board ocean steamers, where space has to be economized, and anything less bulky than anthracite or coke, which would answer equally as well, would be a great improvement. ‘The British Gov ernment particularly encouraged ex periments, and the Engineers of the Admiralty have reported in favor of a system of fire grate, invented by one of their civil engineers, for burn ing oil for this purpose The author ities at Woolwich Dock are about to investigate its merits. The use of Petroleum need, it is said, involve no apprehension of danger from combus tion, unless the oil be heated to a temperature of 80 or 90 degrees. ( Fah) During a course of experiments at Woolwich, it was elicited that the effect of a red hot shot passing through the Petroleum tank of a ship of war would be simply to vaporize the oil ; the vapor harmlessly escaping, unless brought in contact with a flame .The nt could even be used as fuel after the Petroleum spirit had been extract ed from it.