Studies in the sulphur metabolism of the dog

THE racemising action of acetic anhydride on amino-acids has attracted a con- siderable amount of attention recently. For this reason and also because du Vigneaud and Sealock [1932] have suggested that the acetylcysteine made by one of us [Pirie, 1931, 1] was partly racemic it seemed advisable to study this substance further. The metabolic work which we carried out with this doubtful material [Hele and Pirie, 1931] had also to be repeated.