L. 30. P. 7 Mon. May 31. Stem came in this pm & showed me his Papuan & Timor mammal collections. A young active man who leaves a good impression. Hired me to describe the skins he took at Timor. Attended the Society for Dierkunde (monthly meet) in the evening. Three papers were read - all on hybridization. Wed. June 1. Chapin turned up today. Has gained 25 kilos in weight by way of looking. Sat. June 4. Dr. Schultz-Munzinger who has just returned from his expedition to the Jari River, w. of north / Amazonas. Hereafter no steaming at all here. Leave Sunday for Coyo. Thursday, June 9. At 9 a.m. left Baden for Leyden. A hot, dusty trip. Reached J. at 10 p.m. Friday June 10 met Tenge (in charge birds & mammals; Broschma (Director), and L.D. Brongerame (Herpetology, Felidae, etc). At very pleasant pc & we all went to the afternoon of our third / second J pm. Intended to find that "Mud water" Tenthrak is not a Wombiya but a Rattus Sat. June 11. Had lunch with the Tenge. On Sunday we went out in the day with the Tenge to the sand dunes at Katwijk. On Monday we were out in the evening with the Brongerame. He is Herpetologist & also does some things of mammals. Thursday (typo) dinner at the house of Broschma, thc director where met V. Becking, plant physiologist. Sunday went with Broschma & just of his children to Amsterdam Zoological Gardens. The previous Friday we went to Amsterdam to study the types of Sody's