TAIL length: wild NORWAY 



347 



Tail length on body length. The tail length on the body length 

 has been determined by Hatai (MS '14) and is represented by 

 formulas (56) and (57) for the male and female respectively. 

 As can be seen by consulting table 187, the males have the shorter 

 tails — a relation which is somewhat less marked than that found 

 for the Albino. In chart 63 are given the corresponding graphs. 



Chart 61 Norway rat — Giving body length on the body weight. Males only. 

 Formula (53), table 187. Inserted for comparison is the corresponding graph for 

 the male Albino (see formula (4)). 



Weight-length ratios. In table 188 are given the values for the 

 Norway obtained by dividing the body weight by the body 

 length, as these appear in table 187. The ratios in table 188 are 

 consistently smaller than those for the Albino (table 122) as 

 the Norway is longer for a given body weight. Further, the 

 values for the two sexes in the Norway are more alike than in the 

 Albino. 



