The proteins of Arachis hypogaea and fibre formation.

decreases, the error involved in substituting them for 8 ,, and DO in the calculation of a molecular weight will be even lower. Unfortunately, molecular weights calculated from the combined data of sedimentation and diffusion constants are dependent to a considerable extent on the value of the partial specific volume, V, an error of 1 % in V causing an error of about 3% in the final result. The values of 4-6 for 420,,w and 6-1 for D°O., often quoted (e.g. Oncley et al. 1947), give a result of 68 500, but the present work gives 61 500 if we assume the same partial specific volume, 0-733.