BLOOD- — FAT 



199 



Chisolm and giving results somewhat closer to the observations 

 when the determinations are made according to sex. 



These three formulas have been transformed in turn from 

 volume to weight by using as a factor 1.056 — the specific gravity 

 of ■ the blood^ — and three formulas for blood weight (22) (22 a) 

 (22 b) have been thus obtained. These last have been used to 

 compute the weight of the blood as given in table 146. Table 

 136 here given presents Chisohn's data on the other growth 

 changes in the blood. 



Abderhalden ('02) found that the percentage of haemoglobin 

 is higher in the smaller — younger — rats than in the larger — 

 older — ones. 



TABLE 137 



Showing the iveight of haemoglobin per kilo of body weight. Three to five rats in 



each group 



* The corrected body weights are without skin and intestines, 

 are therefore about 75 per cent of the gross body weight values. 



These values 



The results are of the same order as those for the weight of 

 blood but have not been corrected for the change in the per- 

 centage of water, table 137. 



5. Fat. Boycott and Damant ('08, '08 a) have recorded the 

 proportion of fat in rats of both sexes and of increasing body 

 weights. 



The total fat was determined in healthy animals living under 

 ordinary laboratory conditions as to food. No details given. 

 The fat was estimated by Leathes' modification of Liebermann's 

 methods which is easily applicable to the entire carcasses of 

 animals. The figures, given as percentages of fatty acid on the 

 crude weight of the animal, represent therefore masked as well 

 as anatomical fat. 



