~42- with conifers Sparrow (21) observed that doses as low as 3 Yr and 4 r per day caused death of Pinus rigida after six years of exposure plants, (total cumulative dose, however, cumulated dose, about 8000 r). Many were dead or dying at doses much below this and some visible damage was observed at doses below 3 r per day. Observations made in February 1956 in the Marshall Islands by Fosberg (9,1C) also suggest possible radiation damage to plants twenty-three months after an incidence of high level radioactive fallout. the land plants (Guettarda gpeciosa, maritima and others) the He found severe damage in at Gegen Island, Cocos nucifera, Suriana Rongelap Atoll, where "total radiation dose to infinity” was reported to be 3360 r. lower, species Where the levels of radiation were 10 to 100 times little or no damage was observed. (Guettarda, Lepturus repens, However, some and Fleurya ruderalis) appeared to be normal at Kabelle Island where the radiation level was high (total dose 1824 r). Cordia subcordata, Other species (Suriana, Cocos nucifera and Pisonia grandis) were abnormal in appearance at islands where the levels of radio- activity were lower. Fosberg suggested that some species of plants were more susceptible to ra@iation than others.