Accordingly, in the best equipped factories, the practice is to submit the turnings to treatment. It is passed through the extractors and in this way at least all but 10 per cent. of the oil is recovered. When the solvent extraction process is exploited the recovery can be carried as far as 99 per cent., the fraction resisting recovery thus being extremely small. The yield obtainable from such metallic residue from the machines is certainly sufficient to justify the treatment. In one shop, devoted to the manufacture of cycles and cycle parts, the oil recovery averaged 22 pints per 112 lb. of turnings treated. In another instance, where the production of agricultural machinery is conducted, 26 lb. of steel turnings and 23 lb. 9 oz. of brass turnings yielded 1·75 and 1·125 pints of oil respectively. One motor-car manufacturing firm recovers 1,200 gallons of cutting oil from the treatment of its weekly accumulation of turnings. This becomes available for re-use, and the absolute loss recorded is only about 10 per cent. In another instance, 2,440 gallons of oil were recovered from the treatment of 41 tons 17 cwt. of metal turnings, 900 lb. of rags, and 19,300 sponge cloths in the course of six months. Another interesting experience in this field is worthy of record. It was found that the sawdust in the vicinity of certain machines, provided as an absorbent, became somewhat heavily charged with oil splashed and otherwise discharged from the machines. The presence of the oil-soaked refuse on the floor was construed as being a menace to the establishment, the hazard of fire being regarded as thereby increased. Accordingly, the floor was swept more frequently than otherwise would have been the case, the refuse being promptly shovelled into the furnace merely to secure its prompt and complete riddance. The sawdust was examined by a waste expert upon the occasion of a visit to the works, and he suggested, from the fact that oil oozed from a handful of the sawdust when squeezed, that the waste should be subjected to the “Iwel” oil-reclamation process, instead of being burned. The recommendation was followed, and the volume of oil thus recovered was found to be of surprising quantity. In fact, its value more than defrayed the cost of the small plant which was installed to treat it. So effectively was the sawdust found to be cleaned of the oil as to be redistributed time after time upon the floor around the machines. In this instance destruction of the oil-soaked refuse by fire represented a material loss in more senses than one.