Fig. 4.23-——Land plants from Engebi, postshot. (a) and (b) Portions of T. procumbens. (c) F. cymosa, upper portion, not washed; lower portion washed with running tap water. (d) Autoradiographs of (a), (b), and (c). Autoradiograph (d) was produced by a seven-aay exposure to Super XX pan film, 719 UNCLASSIFIED. RESTRICTED