Nevertheless, the results achieved with the prevailing type of plant afford interesting reading, although it is somewhat misleading to cite them. The material varies so widely both in quantity and quality, while the ultimate fat-yield likewise fluctuates markedly. A fat bullock which has been condemned would naturally be expected to furnish a good contribution of fat. On the other hand, only a low percentage could reasonably be anticipated from a lean cow. In these circumstances a comparison without full details concerning the material handled is difficult. The figures available may be set down as being representative, though they should be accepted as being typical rather than empirical. A consignment of condemned meat, weighing 2,240 lb., was placed in the digester. The quantities of the respective materials recovered were:-- Lb. Per cent. Tallow 336 or 15 Fibrine or meat-meal 392-428 or 17¹⁄₂-20 Bone-meal 280-336 or 12¹⁄₂-15 In another instance a somewhat heavier consignment of condemned meat was committed to the recovery plant. Its composition was:-- Lb. Beef 84,000 Pork 1,607 Mutton 818 Veal 354 Offal 20,370 -------- Total 107,149 The tallow yield was 21,638 lb., or 20 per cent. of the total volume passed through the digester. Pronounced quantities of the fibrine and bone-meal were also secured. But the tallow yield alone should serve to convince even the most sceptical that it pays to submit condemned meat and slaughter-house refuse to a process of by-product recovery. It was not so many years ago that such valuable waste met with an untimely end--incineration in the destructor as the most effective and economical means for its disposal. Had this practice been followed in the instance under review the authorities would have allowed material worth, according to current market quotations, at least £500--$2,500--to vanish up the chimney in preference to the display of a little exertion and knowledge to secure what is in such wide and urgent request--the fat.