GENETIC STUDIES OF RABBITS AND RATS. 



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Mean ear-length, 105.35 ±0.43. S. D. ear-length, 3.86 ±0.10. 



Mean weight, 214.15±16.8. S. D. weight, 448.6 ±11. 9. r, 0.836 ±0.011. 



Table 13. — Correlation of ear-length with skull-length. 



Mean ear-length, 105.45 ±0.42. S. D. ear-length, 11.46 ±0.28. 



Mean ekull-length, 73.03±0.16. S. D. skull-length, 4.42±0.11. r, 0.836±0.011. 



