August-2 grass owls (Tyto longimembris papuensis). We also passed a fair-sized stream that suddenly dropped with a roar into a sink hole in the limestone based plain and thundered away under our feet. The crest of the Ridge was crowded with the stems of a [illegible], delicate species of tree fern. The red petals of a climbing Rhododendron sp. littered the trail to Mt. Samiang. MacGowan set up a base camp on August 19 preparatory to climbing Mt. Upusenga on the 20th.