Contents 



Session I 



Cell Function in the Format toil, Maintenance and Destruction of Osseous Tissue 



Chairmen: P. Gaillard, I. MacIntyre, H. J. Dulce, A. B. Borle 



L. F. Belanger, T. Semba, S. Tolnai, D. H. Copp, L. Krook and C. Gries 



The Two Faces of Resorption 1 



W. A. DE VooGD van der Straaten 



Some Remarks and Questions on Metabolic Patterns in the Family of Bone Cells ... 10 



Ch. M. Lapiere 



Remodelling of the Bone Matrix 20 



M. E. HOLTROP 



The Origin of Bone Cells in Endochondral Ossification 32 



M. Owen 



RNA Synthesis in Growing Bone 36 



J. S. Greenspan and H. J. J. Blackwood 



Histochemical Studies of Chondrocyte Function in the Cartilage of the Mandibular 



Condyle of the Rat 40 



A. B. Borle 



Correlation between Morphological, Biochemical, and Biophysical Effects of Para- 

 thyroid Hormone on Cell Membranes 45 



P. A. Thornton 



Vitamin D-ascorbic Acid Association in Bone Metabolism 48 



C. B. Sledge 



Lysosomes and Cartilage Resorption in Organ Culture 52 



G. Vaes 



Acid Hydrolases, Lysosomes and Bone Resorption Induced by Parathyroid Hormone . 56 



A. Dhem 



Le forage des canaux de Havers 60 



E. Rutishauser, W. Taillard and B. Friedli 



Experimental Studies of the Non-inflammatory Vascular Pannus 63 



L. V. AviOLi and Ph. H. Henneman 



Urinary Pyrophosphate in Disorders of Bone Metabolism 67 



J. JOWSEY 



Bone Formation and Resorption in Bone Disorders 69 



J. C. Birkenhager, J. VAN DER Sluys Veer, R. O. van der Heul and D. Smeenk 

 Studies of Iliac Crest Bone from Controls and Patients with Bone Disease by Means 



of Chemical Analysis, Tetracycline Labelling and Histology 73 



