Within the limits of this article we cannot do full justice to the enormous industry of which Mr. Young is the founder. It is even claimed for Mr. Young's little factory at Alfreton that it was the parent, not only of the Scotch mineral oil trade, but also of that of America; for oil had never been distilled to produce an article of commerce until he commenced to work his patent there. From such a small beginning has arisen, within the short space of twenty-three years, one of the most important and extensive industries in the world. At the present time there are in Scotland altogether 65 oil-works, at 17 of which crude oil is manufactured and refined ready for the market. At 38 other works the crude oil alone is produced, and although most of the crude oil so made is refined at other works in Scotland, a not inconsiderable quantity is sent to the Welsh refiners, while some of it is sent to the Continent. Of the remaining works, 16 refine the crude oil only. There are altogether 3804 retorts in operation, both vertical and horizontal. It is a moot point, which is now engaging the attention of those in the trade, whether vertical or horizontal retorts are the best suited for the purposes in view. At Mr. Young's works, which are the largest and most important in Scotland, nothing but vertical retorts are used, it being considered that they possess an advantage over the horizontal kind in respect of their continuous feeding, but the latter are likewise very largely used. Of the 3404 retorts, however, there are seldom more than 3000 at work together. The remainder are usually standing idle, on account of repairs or some other cause. The average weekly production of crude oil at the Scotch works is nearly 120,000 gallons, and the number of men engaged in the trade in its various departments is estimated at little short of 6500. Assuming, as we may fairly do, that 3000 retorts are regularly at work, they will yield 21,800,000 gallons of crude oil, and distil 730,000 tons of shale annually; or, in other words, they will distil 13,000 to 14,000 tons of shale weekly. From the crude oil thus distilled there will be produced something like 10,000,000 gallons of refined burning oil annually, besides crude solid paraffin, and other products, such as naptha and lubricating oils. It is further calculated that the average wages paid in connection with this industry will reach between L400,000 and L500,000 per annum. The districts in which the manufacture is carried on are situated in Midlothian, Ayrshire, Lanarkshire, Fifeshire, and Linlithgowshire. The largest works are in the Midlothian and Linlithgowshire districts, the Fifeshire and Ayrshire works being comparatively limited in extent, and chiefly confined to the manufacture of crude oil. Some of the principal works have been considerably extended of late.