||Of 29 isogenic reciprocal translocation lines of Taichung 65 introduced from Dr. Oka of National Institute of Genetics in Japan (RT 61～RT 89), 23 lines were used in this study. The remains were exclud...ed from the study, because they were unsuitable for cytological observation. Interchanged chromosomes were mainly analyzed by observing chromosome configurations at meiosis in F_1 of crosses between these lines and reciprocal translocation testers, intercrosses of these lines and crosses of these lines with trisomics. In this study, the numerical numbers of chromosomes were accorded with Nishimura's (1961). From the results shown in Tables 4, 5, 6 and 7, interchanged chromosomes in all lines were identified (Table 9). As seen in the table, some lines had the same interchanged points. The interchanged point of RT 61 was presumed to be different from RT 65, because the seed fertility and the chromosome configurations at diakinesis in the translocation heterozygote of RT 61 were different from those of RT 65 (Table 8).