Figure 20, Photograph of the deven samples shown in Figure 19 Figure el. Autoradiograph of algae specific activity Figure 24, Figure 25. 91 93 Figure 22. Corals showing white nodules of high Figure 23. Page 95 (a)Autoradiograph of goatfish showing radioactivity in gills; (b) of fish in (a) Photograph (a)Composite photograph of fish used for autoradiograph (b (a)Photograph of land plants used for autoradiograph (b) 97 98-99 100