V. Merrimack 1943 Perognathus Californicus June 17, M.V.Z. mice to fill the hole. They are both down inside now. I occasional here digging, but I can not see anything of it. Most of the time it is quiet and I do not hear anything. I made other trenches before Mike joined Pat, but he showed no interest in further excavating these. When I left at 5 o'clock they were still down in the burrow. June 18, This a.m. on arriving I found the food etc. apparently untouched. The plugged hole looked the same as on the evening before. I dug up the burrow and found that the first part was well plugged and that the mice were at a great distance from the opening. ```