Hops are an essential to the brewer, not only keeping the beer and giving it an exquisite flavour, but also assisting, if we may be pardoned for using a technical term in a work intended to be anything but technical, to break down the fermentation. Hops are valuable according as they contain much or little of a yellow powder called lupuline, and technically known as “condition,” which is deposited in minute yellow adhesive globules underneath the {81} bracts of the flower tops, and amounts to from 20 per cent. to 30 per cent. of the dry hops. This powder has a powerful aromatic smell, and is bitter to the taste. It contains hop resin, bitter acid of hops (flavour familiar to bitter beer drinkers), tannic acid, and hop oils, the chemical composition of which is not accurately known. Hops contain most lupuline when the flower is fully matured. Year-old hops only command about half the price of new. Those two years old are called “old-olds,” and are still less valuable. After having been five years in store they are worthless to brewers. Nearly all hops intended to be kept are more or less (the less the better) subjected to the fumes of sulphur, which, oxidising the essential oil, converts it into valerianic acid, and combines with the sulphur to form a solid body. Thus the oil, which would otherwise be the cause of mould, is destroyed, and the hops can be kept. We believe it is the practice of the best brewers to use a mixture of new and old hops, the latter being slightly sulphured, so slightly, indeed, that the smell of the sulphur cannot be detected. Much has been written on the injurious effects of sulphuring, both to the fermentation and the health of beer-drinkers, and some people have very strong views on the subject. In 1855 a commission, which included Liebig among its members, was appointed by the Bavarian Government to inquire into the matter. After experiments which lasted over a period of two years, a report was issued in which it was stated that in the opinion of the commissioners, sulphuring was beneficial to the hops, and in no way prejudicial to the fermentation. In 1877, a method was made known of preserving hops without sulphur. The oil which prevents the hops from keeping was separated from them by a chemical process, and bottled. The hops were then pressed and kept in the usual way. When required for brewing, the hops and oil could again be united by adding ten or twelve drops of the latter to every twenty-two gallons of beer. This system does not seem to have found favour with hop merchants.