16 THE EFFECT OF 1,25-DIHYDROXYVITAMIN D3 ON THE SYNTHESIS OF THE VITAMIN K-DEPENDENT PROTEIN OF BONE17 EFFECT OF VITAMIN D ON CULTURED BONE CELLS; 18 RECENT ADVANCES IN THE QUANTITATION OF VITAMIN D AND VITAMIN D METABOLITES; 19 STRESS TESTING OF PLASMA 1,25-DIHYDROXYVITAMIN D IN MAN; 20 MEASUREMENT OF VITAMIN D AND ITS METABOLITES BY GAS CHROMATOGRAPHY-MASS SPECTROMETRY; 21 SYNTHESIS AND BIOLOGICAL ACTIVITY OF VITAMIN D CONJUGATES; 22 APPROACHES TO THE SYNTHESIS OF VITAMIN D SECOSTEROLS; 23 VITAMIN D AND INVOLUTIONAL OSTEOPOROSIS; 24 SARCOIDOSIS. 25 VITAMIN D ABNORMALITIES IN HYPOPARATHYROIDISM AND PSEUDOHYPOPARATHYROIDISM26 ROLE OF THE VITAMIN D SYSTEM IN THE PATHOGENESIS OF RENAL OSTEODYSTROPHY.; 27 USE OF VITAMIN D ANALOGUES IN RENAL FAILURE; 28 ABNORMALITIES OF VITAMIN D METABOLISM AND ACTION IN THE VITAMIN D RESISTANT RACHITIC AND OSTEOMALACIC DISEASES; 29 RESISTANCE TO VITAMIN D; 30 VITAMIN D METABOLISM IN IDIOPATHIC RENAL NEPHROLITHIASIS; AUTHOR INDEX; SUBJECT INDEX.