The first number of the Journal-of the Marine Biological Association appeared in August 1887, during the final stages of the building of the Laboratory, while research was being carried out from rented rooms in the Barbican. To celebrate the centenary of this outstanding serial publication in marine science, and the centenary of the opening of the Laboratory in June next year, we are including in the present issue an updated account of the history of the Association, based on a version originally published in 1984 to celebrate the founding of the Association in March 1884. We are indebted to the Council of the Devonshire Association for the Advancement of Science for permission to reprint a substantial part of the text that appeared in their Transactions for 1984.