38 GENETIC STUDIES OF RABBITS AND RATS. 



Tabu! 22. — Correlation offemur4engih with skull-length. 



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



Mean skuU, 73.06±0.16. S. D. skull, 4.63±0.11. t, 0.871 ±0.008. 



Mean tibia, 93.74 ±0.20. S. D. tibia, 6.45 ±0.14. 



Mean skuU, 73.06±0.16. S. D. skuU, 4.54±0.11. r, 0.806±0.015. 



