AbstractThe rate of drying of single layers of sugar beet cossettes has been found to vary markedly with temperature of the drying air from 140 to 220° F, and to increase slightly with a fourfold increase of air velocity, while humidity changes have little effect. The rate of drying is proportional to the total moisture content of the cossettes.A method of predicting the rate of drying of cossettes in beds up to 9 in. deep is given, for air velocities in the range 6–21 lb./sq. ft./min., for temperatures of 140 to 220° F, and humidities up to 40% R.H. The accuracy of the method is shown to be within +‐15%.Observations have also been made on the variation of internal temperature with change of moisture content and air temperature, and on the evidence of carameliz