1. Congenital pseudarthrosis of the clavicle is described. 2. The distinction from cranio-cleido-dysostosis and from birth fracture is stressed. 3. Details are given of two patients reported in the literature and a further nine patients are described. 4. The embryology, natural history and treatment of the condition are discussed.

Hydatid disease of bone is rare. Ivanissevich (1934) gave an incidence of 2 per cent of all forms of hydatid disease in South America, but in Australasia it is less than I per cent. Ninety new patients with hydatid disease are admitted to New Zealand hospitals every year and the death rate from it in New Zealand is &23 per million. This is twenty times as great as that in the United Kingdom, and is attributable to the remarkable disproportion between the human population (two million) and the sheep population (forty-seven million). Forty-three cases of hydatid disease of bone are recorded in the Louis Barnett Hydatid Registry

ZEALAND 'l'he muuetacarpo-phalangeal joihit of the thumb permits flexion aiud extension omuly aiud the range varies widely imi different individuals, This is due to differences in thue shape of the muietacarpal luead ahud the tension of the capsule. Joseph

No abstract