Background information on the Pioneer Health Centre. The Pioneer Health Centre, the Peckham Experiment, was established in the 1930s 'as a laboratory for the investigation of human health' based on the idea of 'human ethology'. The Centre closed in 1950 but in 1977 Tinbergen was invited to join a scientific advisory committee overseeing a new Centre to be opened in Fifeshire.

Correspondence with Karl Popper regarding Popper's 1973 Herbert Spencer Lecture 'The rationality of scientific revolutions'.

Typescript copy of Poppers lecture, inscribed "To Nikolaas Tinbergen from Karl Popper".

Correspondence with (Major) Jimmy Rose regarding Ravenglass Nature Reserve, Cumbria.

Rose's Ravenglass Reserve Newsletters. Not a complete sequence.

Rose's Ravenglass Reserve Newsletters. Not a complete sequence.

Manuscript jottings relating to Ravenglass; 5pp typescript draft (in Dutch) 'Border Collies' on the use of collies as sheep-dogs in Upper Teesdale.

Correspondence with Peter Scott (1986, 1987), (T.R.E.) 'Richard' Southwood (1980), and Anthony Storr (1968, n.d.).

Correspondence with Jan Tinbergen (1973-1988) and Jan Verwey (1969). Jan Tinbergen was Tinbergen's elder brother and winner of the Nobel Prize for Economics 1969.