Lehner P. 1964 Dec. 8 we picked up the mice caught in the 25 traps last night; we had 21 mice which we autopsied and took the following data on: morphological measurements, weight, sex, age, ectoparasites, condition of reproductive tract, measurement of reproductive organs, and cased the skin; we set the traps again after supper. Dec. 9 today we caught 20 mice and spent most the day autopsying them; we reset the traps after supper but this time moved them from the east end of the island to the west end.