in St. Vrain creek bottom just below Lyons all forenoon. Also collected some Mollusca. Zonitoidea arboreans plentiful under a narrow leafed poplar log. Markman and Harry out after birds etc. Went back up creek and collected Vallonia sp. , Oreohelix strigosa and a few O. albofaciata at end of Dakota sandstone ridge. Dodds took pictures of valley. Left camp after a late dinner for crossing of Little Thompson Creek . Dodds and Markman went to Hygiene with the wagon to ship the plant collections (including a fine collection of fungus) to Dr. Ramaley at Boulder who is to attend to drying, arranging and labelling them. Harry and I crossed the headland formed by the big fold in the Dakota sandstone, travelling afoot. The heat was terrific. By the time we reached the Little Thompson Creek at the end of the Niobrara ridge we were very tired. We took off our boots,