=Butcher Fats.=--Kidney fat yields the largest percentage of stock of any fat in the animal. The fat in this particular part seems to be richer in oil and in the general handling of same it rarely goes into the water to absorb additional weight, as it is generally purchased from the retail butcher after the carcass has been cut up. This in itself is a large branch of the business, in many places melters making a practice of collecting from the butchers their bones, tallow and fat. The following test will give an idea of the yield of the different products brought from a butcher’s shop, when used in an oleo factory or tank room. The prices quoted are those that were paid at the time tests were made. The percentages, however, are accurate. STOCK YIELD FROM 649 POUNDS OF KIDNEY AND COD FAT. Stock 507 lbs., or 78.12%, at 9¹⁄₂c per lb. = $ 48.16 Expense Pkgs., $1.45; labor, $1.27 = 2.72 ------- Net value $45.44 Value per 100 lbs., based on weight of fat, $7.00. STOCK YIELD FROM 2,004 POUNDS OF PICKINGS. Stock 1,124 lbs., or 56%, at 9¹⁄₂c per lb. = $106.78 Expense Pkgs., $3.83; labor, $5.01 = 8.84 ------- Net value $ 97.94 Value per 100 lbs., based on weight of fat, $4.89. TALLOW YIELD FROM 10,787 POUNDS OF BONES. No. 1 tallow 1,513 lbs., or 14.02%, at 6¹⁄₂c per lb. = $ 98.34 Stock of tankage 1,750 lbs., or 16.22%, at $16 per ton = 14.00 Waste 7,524 lbs., or 69.76%. Expense, labor 2.25 ------- Net value $110.09 Value per 100 lbs., based on weight of raw bones, $1.02. SUMMARY. Per 100 lbs. Net value kidney and cod fat $7.00 Net value pickings 4.89 Net value bones 1.02 Net value kidney, cod and pickings combined 5.40 Net value kidney, cod, pickings and bones combined 1.89 The above is based on green weights. No deductions for steam power and administrative expenses. The following is the percentages of products used in above test: Per cent. Kidney and cod 4.83 Pickings 14.91 Bones 80.26 ------ 100.00 _Test on Oleo Scrap._--The following is a test on the scrap from foregoing test after all the oil had been extracted, which was put into a rendering tank and cooked for twelve hours with forty pounds pressure: TEST ON OLEO SCRAP.