GENETIC STUDIES OF RABBITS AND RATS. 37 



TABLE 20. Correlation of weight with tibia. 



Mean weight, 2,143.616.8. S. D. weight, 446.611.9. 



Mean tibia, 93.77 0.20. S. D. tibia, 5.29 0.14. r, 0.758 0.015. 



TABLE 21. Correlation of humerus-length with skull-length. 



Mean humerus, 64. 16 0.13. S. D. humerus, 3.77 0.09. 



Mean skull, 72.960.16. S. D. skull, 4.460.11. r, 0.834 0.011. 



