GENETIC STUDIES OF RABBITS AND RATS. 



41 



Mean tibia, 93.69 ±0.19. S. D. tibia, 5.48 ±0.14. 



Mean femur, 80.76 ±0.18. S. D. femur, 5.19 ±0.12. r, 0.927 ±0.005. 



Table 30. — Correlation coefficients derived from tables 12 to 29. 



Table 31. — Number of size factors indicated by each set of Tneasuremenls as differentiating 



the three races crossed. 



