8. Markers in all chromosomes and in back-ground favorable for the State of S. Paulo (Brazil) and probably for South America conditions are now available. Trisomic stocks for chromosomes 2 to 10 segregating recessive genes in the respective chromosomes are now available and the trisomic segregation will be checked again this summer. The transference of deficiencies in chromosomes 3,4,5,6, and 9 (material from Dr. Stadler) to Brazilian strains is being continued.