to be approximately equal in activity. Muscle, however, is more radioactive. The fact that the activity within the bone was zero in both the birds and rats is of interest. In the 1949 radiobio- logical resurvey of Eniwetok, the amount of activity in the bone samples of rats was positively correlated with the radioactivity of the habitat as indicated by survey meter readings. The habitat of the rat specimens at the time of the present preshot collections had a low reading, in all cases beingless than | 1 mr/hr. Analysis of Organs and Tissues, Post Shot. In Table 1€b the data for the post shot rat collections are given. comparison of the same organs and tissues cept for the digestive tract) [In @4 in six specimens (ex- the disintegration rate does not differ in any instance by more than a factor of 7. In a comparison of the same organ or tissue in the different specimens of birds collected at any one station (Table 4, Appendix) greater variations in disintegration rates are found than were evident in the rats. The maximum variation occurred in the livers of the Rigili terns where the greatest difference | was by & factor of 470. Analysis by Island. In general, the variability of activ- ity for specific organs between individual birds precludes the possibility of significant differences existing between average values for various collecting stations. However, when the aver- age values for the different organs for individual stations are en. - 69 9 - oe at ORM oo \ Whee