Abstract
1 A modification of the method of T OMAS et al. for the determination of arginine in protein hydrolysates was discussed.
2 It was thown shat the amount of tyrosine in the samples and the varying amounts of hypobro. mite used for the estimation were highly important factors contributing to consistent results.
3 The arginine value obtained for a vacum dried lactoprolactin, was 3.02 per cent by the modification of the ThomAS methed and was lower than the values of beef and sheep prolactin reported by EVANS et al.
