Thursday, June 29 [1871] - After the Camp broke up went with the Photographic corps on a hill overlooking the vale and changed the papers of the pressed plants, while Jackson took pictures ... The hills in this passway to Montana are all of igneous character; but there are other varieties of rock boulders (principally quartzites) indicating a different character to the higher mountain passes around. ... After 12 miles traveled today in which we were rapidly ascending we came to the summit of the Chain—the Divide (Monida Pass). ... At our camp the P.M. five miles from the divide, we have excellent grass and water, and it is understood that we will remain over here one day to recruit. Collected and pressed a large amount of plants. Also found in the streams a number of shells--lymneas and physas. Junction stage station is near our camp.