UNDER the above title, Mr. T. H, P. Heriot, the lecturer on sugar manufacture at the Royal Technical College, Glasgow, has communicated a paper to the Royal Philosophical Society of Glasgow which has recently been published in its Proceedings. Since its appearance the subject has occupied the attention of the Royal Society of Arts, and the issue of the journal of the society for June 14 contains an interesting paper by Mr. George Martineau, which traverses much the same ground as that of Mr. Heriot and arrives independently at the same conclusions. The subject is so important at the present juncture, and our position with-respect, to it, in view of our prospective relations with our enemies, so, serious, that no excuse is needed for referring to it. The general course of the development of the sugar industry is too well known to require any detailed description. Both authors deal with it in the introduction to their papers at just sufficient length to render the nature of their arguments and the conclusions to which they arrive intelligible and obvious to their readers.