Four series of experiments carried out from 1943 to 1951 in five experiment stations of the Instituto Agronômico de Campinas are described, in which 22 castor bean strains were compared with the dwarf variety n.° 38. This series comprises 10 experiments, one in Campinas, one in Tatui, two in Jau, three in Ribeirão Preto, all in the "terra roxa" type of soil, and three experiments in Pindorama, in sandy soil. It was noted that the strains L881, L882 and L883, in Ribeirão Preto, and the strains L 168 and L 881 in Pindorama yielded more than the check variety n.° 38. In all other locations none of the new strains was significantly better than variety n.° 38. The regional behaviour of the strains will be tested in new experiments in the locations where they gave higher yields, before they are released for multiplication.