Cyclical activity in endocrine systems : proceedings of a symposium held at the Zoological Society of London, Regent's Park, London, on 8th December, 1959. Symposium on cyclical activity in endocrine systems Barrington, E. J. W. Ernest James William Biological Clocks Congresses. QL1 .Z733 no. 2 591 ZOC London : The society ; 1960. 1960. 1960 Text 120 p. eng Symposia of the Zoological Society of London ; no. 2 Symposia of the Zoological Society of London ; no. 2.