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(All right. re8erved) PAGE Protocatechuic acid, the substance responsible for the hardening of the cockroach ootheca. By M. G. M. PRYOR, P. B. RUSSELL and A. R. TODD . . . . . . . . . . . . 627 The spectrophotometric determination of tyrosine and tryptophan in proteins. By T. W. GOODwn and R. A. MORTON . . . . . . . . . . . . . . . . . 628 The estimation of threonine and serine in proteins. By M. W. REES. (With two figures) . . . . 632 Tetryl dermatitis. *2. The interaction of aromatic mitro-compounds with amino-acids and proteins. By I. A. BROWNLIE and W. M. CUMMNG. (With six figures) . . . . . . . . . 640 A modification of the fluorimetric method of determining riboflavin in biological materials. By E. C. SLATER and D. B. MORELL. (With two figures) . . . . . . . . . . . . 644 The fluorimetric determination ofriboflavin in urine. By D. B. MORELL and E. C. SLATER . . . . 652 Carotenoid pigments ofBadami mango fruit. By G. B. RAMAsARMA, S. D. RAO and D. N. HAIM . . . 657 Porphyrin metabolism in yeast. By J. E. KENCH and J. F. WILKSON . . . . . . . 660 The fatty acid and glyceride structures of Indian buffalo milk and depot fats, and some characteristics of eastern animal fats. By K. T. ACHAYA and B. N. BANERJEE. (With one figure). . . . 664 Indigoid pigments derived from a pathological urine. By C. RMINGTTON. With an addendum on 'The spectral absorption of the pigments' by E. R. HOLIDAY and E. M. JOPE. (With six figures) . . . . 669 Combination between different protpins and between proteins and yeast nucleic acid. By A. KLECZKOWSKI. (With one figure) . . . . . . . . . . . . . . . . . 677 The determination and isolation of the organic acids in fruit. By F. A. ISHERWOOD. (With four figures) . 688 The fixation and retention of ascorbic acid by the guinea-pig. By J. R. PENNEY and S. S. ZILVA. (With four figures) . . . . . . . . . . . . . . . . . . 695 Spectrophotometric study of the excretion products of mepacrine compared with synthetic acridine and diph.enylamine derivatives. By E. J. KING, M. GILCHST and A. L. TURNOKY. (With five figures) . 706 Observations upon the application of partition chromatography to the determinationof the monoamino-acids in proteins. By G. R. TRISTRAM. (With three diagrams) . . . . . . . . . 721 Studies on mustard gas(,Bp'-dichlorodiethyl sulphide) and some related compounds. 1. General introduction and acknowledgements. By T. E. BANKS, J. C. BOUrRSNELL, G. E. FRANCIS, F. L. HoPwoOD and A. WORMALL . . . . . . . . . . . . . . . . . 734