This thesis presents a study of the strange particle production in ir+p interactions at an incident pion momentum of 4 Gev/c. The Saclay 81 cms. liquid hydrogen bubble chamber was exposed to a bead from the CERN proton synchrotron and 70,000 pictures vere obtained. The analysis of those events with at least one observed strange particle decay is presented, with reference to the non-strange interactions at this energy. Chapter 1 reviews the background to the experiment. In Chapter 2 an account is given of the apparatus and processes used to analyse the events. Chapters 3 and 4 describe the methods used to analyse the V° and charged V events. Cross-sections results and a brief discussion of the strange particle events with four charged secondaries are considered in Chapter 5. In Chapter 6 all the strange particle reactions with two charged secondaries are considered in detail and in Chapter 7 details of the Gottfried and Jackson analysis are given and the results for two reactions considered. Finally in Chapter 8, the Buddha meson and the possible g decay modes of non-strange mesonic resonances are discussed.