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Science  16 Jul 1943:
Vol. 98, Issue 2533, pp. 63
DOI: 10.1126/science.98.2533.63


In a revision of the proof a serious omission was made in the inadvertent dropping of "and 1 ml. of 0.1% CuSO4 5H2O solution" after "Aliquots of 2.0 ml are mixed with 6 ml of clear 12.5 per cent Na2C03 solution" on p. 405. Addition of copper is essential in enhancing the sensitivity of the Folin reagent, as already noted by others.