38 



GENETIC STUDIES OF RABBITS AND RATS. 



TABLE 22. Correlation of femur-length with skull-length. 



Mean femur, 80.80 0.19. S. D. femur, 5.20 0.13. 



Mean skull, 73.060.16. S. D. skull, 4.530.11. r, 0.871 0.008. 



TABLE 23. Correlation of tibia-length with skull-length. 



Mean tibia, 93. 74 0.20. S. D. tibia, 5.45 0.14. 



Mean skull, 73.06 0.16. S. D. skull, 4.54 0.11. r, 0.8060.015. 



