The results of the eighth and ninth series of experiments with strains of the varieties N.° 38 and Backer 374, carried out from 1951 to 1956, in two experiment stations of the Instituto Agronômico de Campinas are presented. These two series comprise six experiments, one in Ribeirão Prêto and five in Campinas. In the eighth series the strains 1220, 24, and 881 yielded more than the check variety N.° 38. It was noted that the strains 374-2 and 374-21, in the ninth series yielded more than the check varieties numbers 374 and 372.