This merely represents the endeavours of one firm. There are scores of others following a similar line of action. The result is that the demand for fats has reached an unprecedented level. At the moment of writing the coarsest grade of fat is able to command approximately £50--$250--a ton. Is it surprising therefore that every effort should now be made to extract the fats, grease, and oil associated with every form of organic waste, and that keen effort should be made to secure increasing quantities of waste capable of yielding this material? So far as the public is concerned this spirited search for fat may be regarded with misgiving, if not absolute alarm. The wizardry of the chemist is acknowledged, and the thought possibly prevails that much of the fat now being turned into margarine is really only fitted for the production of soap. But alarmist or pessimistic feelings in this direction may be speedily allayed, though it is permissible to point out that ten years ago much fat was turned into the cleanser which should have been utilized as a foodstuff, inasmuch as its freshness and wholesomeness were above all criticism. It was merely turned over to the soap-maker because no alternative application was apparent. But conceding the magical qualifications of the chemist, there are some feats which yet remain beyond his powers. The ability to turn bad fat into good for dietetic purposes must be numbered among those achievements which as yet have proved impracticable. If a fat be rancid it cannot possibly be reconditioned for edible purposes. No matter how its preparation may be coaxed and nursed it cannot be converted into a foodstuff. The palate would detect rancidity instantly. Consequently, only the highest grades of animal fat are used for the preparation of margarine; the fact that the big-scale production of a food should have been embraced by the soap-maker merely represents one of those inexplicable coincidences of industry. It is distinctly interesting, if not actually amusing, to follow what may be described as the utilitarian conjugation of waste. It remains an incubus, if not an unmitigated nuisance, until the chemist, or some other keenly observant individual possessed of a fertile mind, comes along to rake it over and to indulge in experiments. Such efforts are often followed with ill-concealed amusement. A few years since they were even regarded as so much waste of time. In due course some definite conclusion is reached, and the fact becomes driven home that, if such-and-such a process be followed a particular spurned refuse can be utilized as raw material for the production of some specific article. Then scepticism and amusement give way to intense interest and speculative rumination. The new idea is submitted to the stern test of practical application upon a commercial basis, while the financial end of the proposal, which is the determining factor, is carefully weighed.