The main feature was an enormous battery of stills, set in a row and joined together with a tangle of pipes; each still big enough to have served the purposes of all the bootleggers of the United States. In the first still the crude oil was heated to a certain temperature, and it gave off one of its products; this was the “cracking” process. The remainder went on to the next still, where it got a little hotter, and gave off something else. So it went from still to still—the process known as “continuous” distillation. The product from each still was run into a big condenser, and from there into its own tank; so you got gasoline of several qualities, and kerosene and benzine and naphtha, and a dozen different grades of lubricating oil, and petrolatum, and thick, black lovely tar, and endless pans of smooth white paraffin wax. You can see how in these processes there was room for no end of management, and the discovery of new methods. Dad had a chemist that he never tired of telling about—say, that fellow was a wonder! Dad paid him six thousand a year, and owned everything he discovered, and he had saved the company several millions since it had started. That McEnnis jist lived on carbon rings and chains—he would draw you diagrams on the blackboard, and it would be a purple dye, and then he would add another C-unit, and by golly, it was some green stuff that would cure tape-worms, and the name of it was longer than any tape-worm ever measured. They must meet this wizard; so they went over to the laboratory, which was on a little hill-top away off by itself, so that the inmate might be free to blow himself up as many times as he wanted. McEnnis was pale, stoop-shouldered and partly bald, and peered at you through big spectacles. Dad was proud to introduce “Professor” Irving, and the chemist showed them a row of test-tubes and retorts, and explained that he was trying to ascertain why normal hexane and the more stable methyl cyclopentane are so much less stable to heat than saturated hydrocarbons of the same molecular weight. There was a chance here to effect the biggest saving in refining history, but the trouble was, the maximum percent of defines demanded by the simple general equation—and here the chemist began to write on the blackboard—RCH₂—CH₂—CH₂R₁➳RCH₃+CH₂=CH.R₁—was seldom attained owing to polymerization of the olefines and the formation of naphthenes. After learning which, they went back to the “ranch-house” for a supper of fried chicken, with fresh green corn and honeydew melons from Imperial valley, and then they settled down for a chat. Mr. Irving behaved beautifully; they talked till midnight, and he answered a hundred of Dad’s questions about world affairs, and told what he had seen of relief work in Greece and of diplomacy in France.