59 Actually they are the tail end of the whole Dyak contingent, some of them physically unsound and at least one sub-normal mentally. About half of them probably good boys. Making preparations for our first reconnaissance flight tomorrow. Toxopeus ill and asks to be omitted as an observer. June 21st. Took off at 6.6 AM with Archbold and Rogers as pilots, Yancey navigator, Booth radio operator and Rand, Teerink, Van Arcken, Richardson and myself as observers. Flew in to the approximate position of our proposed base on the Idenburg and then direct to Lake Habbema. The lowlands were covered in cloud for the whole of the flight but the mountains were clear. Archbold made a few aerial pictures of the lake and vicinity. The lake pronounced by the airmen as a suitable landing place. Returned to Hollandia at 10.31 AM. June 22nd. Rainy morning and also showers in the afternoon. Conditions unsuitable for flying. Worked on cataloguing of photographs and in afternoon took my Dyaks into the field. Was pleased with the Dyaks. June 23rd. Second reconnaissance flight. Flew round Mt. Wilhelmina and discovered a great populated valley and a new lake between Habbema and the Idenburg; fine flight. June 24th Third reconnaissance flight; re-examined country discovered yesterday but clouds forced us to return without determining the outlet of the "Grand Valley" found on yesterday's flight. June 25th. Yancey, Rand and self spent day correcting data and getting it on the map.