GENETIC STUDIES OF BABBITS AND RATS. 35 



Table 16. — CorrdaUan of ear-lengOt, with tibiorlength. 



Mean ear-length, 105.42 ±0.41. S. D. ear-length, 11.48 ±0.29. 

 Mean tibia, 93.64±0.19. S. D. tibia, 5.27 dbO.13. r, 0.741 ±0.016. 



Mean weight, 2,141.0±16.9. S. D. weight, 447.0±11.9. 

 Mean skull-length, 73.17 ±0.16. S. D. skull-length, 4.38±0.11. 



r, 0.852 ±0.010. 



