[Germinal population of gonads in some chimerical embryos obtained by connecting pieces of japanese quail and domestic chick blastoderms (author's transl)].

The experimental realization of chemerical embryos (Martin's13 technic) permits a quantitative appreciation of the modalities of the colonization of quail gonads by chick germ cells. Results clearly show that nature and origin of the somatic part of the gonad areas settle the characters of the genital ridges populating, and specially the specific index of asymmetry expressed by the percentage of PGC colonizing the right gonad.