356 



GROWTH IN TOTAL BODY WEIGHT ON BODY LENGTH 



On comparing the relative values here given with those for the 

 albino rat (see p. 183) it appears that for corresponding body 

 weights in the Albino the average values for the fore limbs and 

 hind limbs are low, while those for the trunk are high — a relation 

 which might be expected in view of the greater body length of the 

 Norway^ — ^see tables 123 and 189. 



TABLE 190 



Norway rat — Percentage of total body weight represented by the weight of integument, 



ligamentous skeleton, musculature, viscera and remainder 



{Jackson and Lowrey, '12) 



*Including gravid uterus, which weighed 13.76 grams. 



TABLE 191 

 The mean weight in grams of the crania in each body weight group of the four series of 

 wild Norway rats from Paris, London, Philadelphia, Vienna (based on table 1 

 Donaldson, '12 a.) Each weight group is based on six cases, 3 males and 3 females 



For the corresponding weights of the albino crania see table 133. 



3. Growth of systems. When the values for the five entries in 

 table 190 are compared with the last four in table 124 for the 

 albino rat, it is noted that in the Norway the values for the 

 musculature and viscera are high, while that for the ''remainder" 

 is low. This last difference is due possibly to the smaller amount 



