200 



GKOWTH OF PARTS 



From table 138 based on body weight, it appears that the 

 proportion of fat tends to be greater in the heavier animals, 

 and from the tables based on the data grouped according to sex, 

 it appears that the females have a somewhat larger percentage 

 of fat than do the males. The values for the fatty acids can be 

 transformed into those for fat by multiplying by 1.046. 



The proportion of fat (boiling alcohol extract) has been 

 determined also by Hatai ('17) in a series ranging from birth to 

 maturity (see table 166). 



TABLE 138 

 Giving the proportion of fat (fatty acids) u-ith increasing age (body iccight). 

 on table A, Boycott and Damant {'08 a) 



Based 



Eighty-three rats arranged according to sex 



Males 41 . 

 Females 42. 



11.3 

 16.1 



0.8 

 1.0 



4.4 

 5.6 



GROWTH OF PARTS AND SYSTEMS OF THE BODY IN WEIGHT: 



REFERENCES 



Larger divisions. Barry, '20. Jackson and Lowrey, '12. Jackson, '15 b. 



Systems. Donaldson, '11, '11 c. Donaldson and Hatai, '11, '11 a. Donald- 

 son, '12, '12 a. Jackson and Lowrey, '12. Osterud, '21. 



Ligamentous skeleton. Donaldson and Conrow, '19. Jackson, '21. 



Cartilaginous skeleton. Donaldson and Conrow, '19. 



Weight of cranium. Donaldson, '12 a. Donaldson and Conrow, '19. 



Teeth. Addison and Appleton, '15. Hammett and Justice ,'23. MacGil- 

 lavry, 1875. Meyerheim, 1898. 



Blood. Abderhalden, '02. Chisolm, '11. 



Fat. Boycott and Damant, '08, '08 a. Hatai, '17. 



