60. The discovery of the Great Valley opens up a new, more direct and easier route from the Idenburg to Habbema Lake. Teerink therefore suggests that plans be altered to take advantage of this--first establish a military party on the Idenburg: fly scientific party to Habbema: send a second military party to Habbema: the two milita tary parties to start trail-making from their respective ends and meet in the Grand Valley. The failure of the engines for our three portable radio sets necessitates a flight to Port Moresby for other equipment. This must be done before the party can be flow to Habbema Meer. June 26th. Developed some of my 8 x 10 field camera pictures, using the aero camera equipment. As on the Fly River expedition there is no proper equipment for handling these negatives. June 27th. The fourth and last reconnaissance flight took place today with the usual airplane crew of Archbold, Rogers, Brown and Booth and Rand, Teerink, Van Arcken, Richard- son and myself as observers and Hoogland as passenger. Flew a direct course to #2 camp on the Idenburg and thence direct to Lake Habbema. On the return we dropped do down into the Great Valley and flew low over many small stockaded villages and beautifully patterned gardens. Much of the main flat section of the Great Valley is low-lying and swampy, with small sharp ridges on which the people live. The drainage ditches in the gardens were in many cases full of water. June 28th. In the morning the plane made a trial landing on the Idenburg with only the crew and Teerink and Van Arcken on board. After lunch the first detachment of the military was landed on the Idenburg--ie Teerink, Van Arcken, 5 soldiers and 3 prisoners. The load totalled 2350 kilos. The avergge weight of a soldier with