A textbook section on mixing wool and other fibers before carding, from an International Textbook Co. instruction series. It covers laying out mixes in alternating layers on the picker-room floor, blending wool with shoddy, noils, cotton and silk, and calculating the cost and proportions of mixes using the linking (alligation) method. It then describes mixing machinery: mixing pickers (including the Atlas), the Fearnaught, and the Bramwell automatic picker feed, with figures of the machines. It ends with examination questions.