1. Myositis ossificans as a complication of tetanus is described.

2. Ossification in mesodermal tissue is briefly discussed.

1. A case of multiple pseudo-cystic tuberculosis of bone presenting as a generalised disease of the skeleton in a child is reported.

2. The response to streptomycin and para-amino-salicylic acid is shown.

3. A possible explanation of the etiology of this rare disease is suggested.

1. Details of clinical, radiological, biochemical and histological investigations of a case of metaphysial dysostosis are presented.

2. The patient was a boy of seven years, and showed widespread lesions (involving long bones of limbs, small bones of hands and feet, pelvis, clavicles, and ribs) characterised by retardation of growth and ossification with masses of partly calcified tissue in the metaphyses.

3. No radiological, clinical or histological evidence of renal osteodystrophy was found in the case described.

4. Metaphysial dysostosis is discussed in relation to other chondrodystrophies.