1. Harkness, M. L. R., and Harkness, R. D., in Structure and Function of Connective and Skeletal Tissue, 376 (Butterworth, London, 1965).
2. Harkness, R. D., in Wound Healing: a Lister Centenary Symposium, edit. by Sir Charles Illingworth (Churchill, London, in the press).
3. Harkness, M. L. R., and Harkness, R. D., Nature, 205, 912 (1965).