EAR-SIZE 



11 



spread of the ears, i. e., the distance from ear-tip to ear-tip when the ears 

 are extended in a horizontal position and stretched slightly. Since the 

 measurements in nearly all cases were made by the same observer (Walter) , 

 the personal equation is a fairly constant factor and may be disregarded 



ar length 

 in mm. / 2 3 4 5 6 7 8 9 10 II IB /3 14- 15 16 17 Id 19 



120 



o-.-o-' 



y^-o.-.-o84/ 

 [ 844 



0^f-**ftZisS&&B& 



weight 



m 

 grams. 



-1500 

 -1400 



1300 

 -1200 

 -1100 



1000 



900 

 -800 

 700 

 600 



500 

 400 



300 

 200 

 IOO 



Age /n , 2 3 4 5 & 7 8 9 10 II 12 13 14 15 16 17 J8 /9 

 weeks. 



FIG. i. Chart showing growth in ear-length, and body-weight of a litter of six short-eared 

 rabbits between the ages of two and eighteen weeks. See table i. 



