The author has established data on blood counting of normal rabbits, from the Bioterio of Instituto Oswaldo Cruz, having found the following averages: red cells 5,186,000 per cu. milimeter; white blood cells, 10,419 per cu. milimeter. For shilling's counting, the following values: Heterophiles, 40% basophiles, 2,5%; eosinophiles, 0,2%; monocites, 6,5%; lymphocites 50% and Tuerk's cells, 0,8%. The author confirms Agosin's discovery on the presence of cells morphologically similar to Tuerk's in peripheric blood of normal rabbits. Has done, also, a bibliographical research on this subject.