F.D. Kirkpatrick 1964 Mus musculus Sand Island, Johnston Atoll, Pacific Ocean Dec. P.M. Coast Guardsmen killed a green- 18 footed mouse in the Loran Transmitter (coat) Bldg. This mouse had been released on the grid on Dec. 16. It must have moved not less than 100 yards west along the causeway to the building. Dec. The tide was very high, crossing 22. the causeway and flooding part of the north and west parts of the grid. An unknown amount of mortality occurred. Station dogs killed at least 15 mice that were flooded out of their usual haunts. The water must have killed several. Dec. 11:30 P.M. We set 5 lines of traps 27 (45) for an activity study. 1:30 P.M. One marked mouse was captured. 3:30 P.M. No mice were in the traps. 5:30 P.M. One marked mouse was captured. 7:30 P.M. Ten mice (including an unmarked one) were captured. 9:30 P.M. 22 mice (including 3 unmarked ones) were captured.