132 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS form in biological systems. The second half of this volume is con- cerned with nitrogen-containing com- pounds of biochemical interest. The two major chapters in this portion are devoted to the chemistry and description of amino acids and nitro- genous bases. Four accessory chap- ters discuss the chemistry of melanins, the synthesis of peptides, capsular polypeptides, and the synthesis of bacterial polypeptides. The emphasis, again, is strictly on the chemistry of these materials and not on their physiological properties. There can be little doubt about the fact that this volume is an ex- cellent introduction and description of the innumerable chemical entities which can be found in biological systems. Despite omissions (e.g., the chemistry of the disulfide bond in cystine is not discussed the prosta- glandins are not mentioned and lipofusdn is ignored), this volume still deserves study. It should prove to be a valuable desk reference or dictionary to hundreds of diverse chemicals which are of biological interest.---M. M. RII•GER, Warner- Lambert Research Institute.

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