Locality: Eniwetok Atoll, Date: Eniwetok Island. Aug. 29, 1964 (Sat.) Weather: Personnel: Hot-~showers. 12 + 1. Water conditions: Calm, These are days of decision--what to pack--what to leave-what to throw away. As always on expeditions of this sort with many people involved in the planning, much more equipment and supplies are shipped out than can be used. Just as many more samples--and glass balls--are often collected than can be used. As a result of pressure a move to mail glass balls project was started. The cost: as a personal $1.50-$1.80 to mail a glass” ball to the States. Sample processing concentrated on the birds, sediments, crabs and other odds and ends that had been left over from field trips. Jackson went to Japtan to pick up his rat traps put out the day before. A total of 28 rats were caught in the trap site on the south side boondock area. This trap-catch ratio is high, cating a very dense population There were 19 males, catch. of Rattus exulans. females, 2 not determined in the Of the 6 sexually mature females, (early gestation). mature. 7? indi-~ 2 were pregnant Of the 16 males autopsied, 10 were sexually Crabs of various species caused considerable disturbance.