While the average organization, either municipal or private, conducts operations upon too limited a scale to deal with the gelatinous or “stick liquor,” the large establishments, on the other hand, are confronted with such immense quantities thereof as to render its further treatment justifiable and profitable. But the liquid is extremely thin or weak, that is low in the gelatinous constituent in its crude form, and so requires to be concentrated. To effect this at the lowest cost it should be passed through the Scott multiple effect vacuum evaporators. These are heated by the exhaust steam. In this form of evaporator the heating effect of the steam is multiplied in several stages, thus doing so many times more work for one supply of fuel as compared with a simple evaporator. The evaporation proceeds progressively and continuously, the liquor leaving the evaporator at a high degree of concentration owing to the water having been driven off. The gelatinous residue accruing from this treatment may be blended with the fibrine or meat-meal, thereby enhancing the value of the latter, which thus becomes enriched with ammonia and protein to an appreciable degree. For some reason or other the treatment of the “stick liquor” has not aroused the measure of serious attention in these islands which it deserves. While, of course, greater results are attainable from treatment of the liquid upon a huge scale, yet relatively small quantities can be exploited very profitably, because the jelly finds an attractive market as crude tub size, the demand for which to-day is somewhat keen and firm. Doubtless hesitation to turn the stick liquor to economic account is due to lack of knowledge concerning the improvements in the rendering process, and the difficulty encountered in this direction in the past. Under the old system, where the practice was to evaporate these liquors in open vessels, the nuisance created constituted the insurmountable obstacle. The work could not be carried out without polluting the whole neighbourhood. With the Scott evaporator, however, no more nuisance is created in concentrating the offensive liquor than attends the exploitation of noisome fats by the patent digesting process, for the simple reasons that the work is conducted in closed vessels, and all obnoxious vapours thrown off during the treatment are led to the furnace to be consumed, escape of the free gases into the air being rendered totally impossible. British waste exploiters are beginning to appreciate the advantages of the closed evaporative system, and in their determination to secure every retrievable ounce of commercially valuable products from waste are now devoting greater attention to the stick liquor. The policy is one which cannot fail to pay so long as it is conducted along the correct lines such as I have indicated.