Résumé : We present the data on the Λ(Σ) events produced in final states of K+p interactions at 8.25 GeV/c. Cross sections for Yo production are given for most final states obtained in this experiment, and the results at other energies are listed for comparison. No significant enhancement is seen in the Yo N mass distributions while there is some indication of the production of Y* (1385) and N* (1236) in the Λπ and Nπ systems respectively. An attempt at the description of the reaction K+p→Λpp in terms of a five-point Veneziano amplitude is also included. © 1969.