29 July. Saturday, (25) Thinky over cost and more or less cloudy all day with sun visible at times. Somewhat showery. Calm, or very light southerly wind. Temp. 8a.43°; 12m.44°; 4p.39°; 8p.39° Tried experiment of firing rifle bullet at closed can filled with water. It exploded all right showing the in-compressibility of the water. One shot at 50 yards. Struck fairly in center. Got in some work on "Cluett Voyage" After dinner walked out with Eck, going half way up the slope of the Unnamak. The whole isthmus - "Illinois Fields" - is elevated sea bottom composed of diabose beds of single and gravel. At 2 p.m. Tobias & Bozeman began putting the rubber roofing on and worked till sun