L. 12, P. 6. Wed. Mar. 25. The third trip was planned so that we might look over the new Lake Marguerite and also get a closer view of the Leonard Murray Mountains, after which we would head for home. It was suggested too that since Champion has shortly to patrol the Turama River we should go up by way of that stream to its source and after seeing the Lake and the Mountains, return down the Bamu River. We left aru at 6.58, crossed the mouth of the Fly, the wide delta portion between 7.12 and 7.29, the mouth of the Bamu at 7.34 to 7.39; and entered the Turama just at 8 o'clock. Almost at once I noticed a line of hills well developed between the Turama and the next river to the n.e. the Kikori. We raced up the Turama keeping the hills always on our right, until at 8,17 we began to edge over onto the ridge, which proved on examination the consist wholly of limestone whose surface was etched into millions of hummocks and hollows a hundred feet high or deep. The whole was covered with forest. The bearing from the mouth of the Turama to the Leonard Murray was 300 degrees. To the south stretched the plains that reach away across the lower parts of several rivers as far and the Fly and beyond. Over the now broadly extensive limestone area we could see the Kikori river and beyond it a series of great mountains rising tier on tier to the clouds. A smother of cloud and mist obscured the view for a few minutes, but with its passing Leonard Murray stood out clearly with every line clean cut. It took just one glance to see that the so-called range was in reality a huge volcanic crater with one side torn out. While we were still some ten miles or so from it we curved around and flew east by north bearing on Mt. Melibe to discover the location of the new lake. No difficulty was found in locating the lake which appeared about thirty miles from the volcano. A long narrow piece of water deep and dark, long and narrow with an island in it and several points of land paralleling the long sides. It was placed among great limestone ridges but had many places where the shore was flat and extensive. At the ends especially immense swampy meadows or grasslands could be made out. A number of native houses were to be seen both on the shore and on some of the islands. Leaving the lake whose length (some six miles) ran northwest - southeast, the ship was headed back for Mt. Leonard Murray, our object being to get a glimpse into the crater. We passed close by its nw corner at 3200 meters, high enough to see that it was extinct and that the inner walls of the crater were very steep; then started back on a southerly bearing to trace the Bamu river (on which yesterday's waterfall seen at 7.55) occurs. The course of the Bamu and the Awarra which we picked up shortly afterwards, indicated that we were flying above a ridge extending out from the base of the volcano. Some time later both rivers turned southeast and united to enter the Bamu estuary. Daru was reached about 11.10 a.m. Spent the afternoon with Cahmpion trying to get our newly acquired information into map form. Thur. Mar. 26. Planned a trip to pass straight up along the eastern edge of the Leonard Murray crater onto the plateau of limestone seen half right during the second trip; thence west to observe the Fly basin from greater altitude; and then home "as the crow flies"!. Before we reached the Fly delta however I inadvertently pulled a switch on the radio before something else and something still burned out. So we had to return. The set was not especially damaged but it could not be repaired until too late to make a fresh start. A couple of parachute drops were made in the afternoon also a rice bag enclosed in a second, loose large bag. One chute failed to open. The second had about twenty yards of drift only and the rice bag was successfully landed. Champion and I spent the entire afternoon mapping. In the evening Brass, Champion, Rand and I correlated our notes on the first three trips with the idea of eliminating errors of observation and filling up individual omissions. The plane leaves tomorrow with Archbold, Rogers and Champion for Port Moresby. Champion will return later by boat and we hope to run the deferred trip about April 5th. A summary of the whole geographical layout will be drawn up by me later on.