A few days ago, says the “ Mobile Register,” we published a telegraphic dispatch, briefly stating that a chemist in Egypt had discovered a method of extracting oil !rom cotton seed. We thought it a strange announcement at the time, as the process could not be attended with much difficulty. It now appears, however, from fuller accounts, that the novelty and utility of the discovery consists in clarifying the oil, and rendering it fit for burning fluid, for manufacturers' uses, and for making soap. For these purposes it is said to be well adapted. The Viceroy of Egypt has conferred on the discoverer the exclusive right to clarify and sell the oil for tnti yeii:-.s. We shall look with interest for further accounts of this discovery, and of the value and uses of the clarified cotton oil, as it may prove to be an invention of importance to southern planters.