These four years saw advances in many areas. Further developments in sampling and analytical techniques have opened new avenues of exploration for trace elements and particulate matter. The impact of the GEOSECS expedition was further felt in the field of marine chemistry as the results were still being published. A major field effort occurred as a follow-on to the GEOSECS work (TTO), and intensive sampling was performed in the newly discovered submarine hydrothermal vent fields. An important and unresolved controversy has arisen regarding the ability to measure “preformed” CO2 in the seawater system. In many respects the field of marine chemistry appears to be gaining a momentum spurred by both improvements in analytic techniques and an increasing social and economic relevance.