This review continuesfrom the close of the previous review on Biochemical Analysis (131) to December 31, 1963. The same philosophy also prevails, namely that developments, trends, and potentialities will be emphasized rather than routine applications and minor variations of recognized procedures. Such arbitrary and discriminating practice therefore overlooks many fine contributions that are concerned with the consolidation of information in their field of interest. This is not to disarm criticism in advance, which is futile, but to give some rational explana-