R.D. Kirkpatrick 1964 Mus musculus Sand Island, Johnston Atoll, Pacific Oct. before. 22 An adult ♂ #4 was caught in (cont) trap 49 which was set on the cause- way. I made it into skin and skull RDk #388. The eyeballs were saved in 10% formalin. It was not particularly fat. 10 P.M. ♂ #234 was found dead in trap 48 while the traps were being set. Oct. I caught RDk #389 in trap 49 on 23 the causeway. Oct. RDk #♂ 390 and 391 were caught in 24 trap 49 on the causeway. Four ½-gallon milk cartons (with the top cut off) had been put out west of the grid on 10-23-64. Two of them had Mus feces in them today. Oct. I caught RDk #392 ♂ in trap 49 on 26 the causeway. Oct. A total of 10 ½-gallon milk cartons are 27 out. The mice seem to defecate in them only very sporadically.