174 



GROWTH IN TOTAL BODY WEIGHT 



table 118. Before weighing the membranes were removed and in 

 some instances the crown-rump length was measured (table 

 119). The graph representing the growth before birth from the 



Fetus of albino rat 



Weight in grams 



13 



14 



15 



16 17 



18 



19 



20 21 22 Days 



Chart 20 Shows the course of fetal growth from the 13th to the 22nd day 

 gestation. The data are given in table 118. 



13th day on is given in chart 20 the interval used for one day be- 

 ing two-fifths of that used for 1 gram. 



3. Growth between birth and maturity. The first observations 

 were made at the University of Chicago by Donaldson, Dunn 

 and Watson ('06) on stock rats fed mainly on milk-soaked bread 

 with corn as a staple. The values before fourteen days of age 

 were obtained from weighing different litters, each litter being 



