INDUSTRIALAND ENGINEERING CHEMISTRY 791 resulted in the extraction of a small quantity of a similar amino acid from a sample of dried serum solids obtained by spraying the serum left from acetic acid coagulation of some fresh unpreserved latex. Owing to the smaller amount it could not be purified to the same extent, and its melting point was about 20°C. lower than that of the substance obtained here. The rotation in hydrochloric acid of this impure product was found to be cc3£ = +6.4°. Emil Fischer gives a2S = +10.3 for pure d-alanine hydrochloride.Literature Cited(1) Branch and Miyamoto, /. Am. Chem. Soc., 52, 863 (.1930).